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Welcome back to our class of all, of course, about the complete introduction to data science with

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Python.

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So in this class, we are going to talk about matplotlib and learn how to create a basic matplotlib

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graph or a chart and modify this graph or chart.

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So basically, this is one of the best ways that you guys can use to visualize data inside of Python.

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So to be able to do all this, a divided discourse and fourth by four parts.

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So basically the first part we are going to learn to import matplotlib.

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So basically works pretty much the same way as Banda's, no worse Kibuye.

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So things that we talked about in the past few classes, then we are going to create a really simple

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graph, really create something basic so you guys will see what it all looks like.

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Then I'll show you a more advanced way to be able to write everything down.

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So basically how usually we write down function.

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So this way we are able to create not only one line inside of our graph will not only integrate one

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function of our graph, but have like four or five, six functions inside of our graph.

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So basically more than one X in one way.

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So you can have an infinity of Xs and OS, and then after that we are going to add titles, labels and

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everything.

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And finally, we are going to change the style of our graph and make it more beautiful.

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So we are going to talk about all this inside of this class.

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So let's start.

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So basically, the first thing that we are going to do is pretty simple.

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We want to import matplotlib to be able to work with this Python library work package.

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And how exactly do we import it?

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It's pretty simple.

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So we will write down import and want to import as Matt Plup Lib Dot Bayport.

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So we want to import all this as VLT.

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So basically field you can write down anything that you want, but Kielty is the usual, the usual name

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of the pipeline.

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All right.

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So if you don't write this, if you don't write down this line of code, normally nothing would work

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because you didn't import matplotlib.

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So when everything is ready, what we will do right now, we are going to create a basic graph with

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just one function inside of it.

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So basically it's going to be one line.

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So we'll have one X and one white.

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So let's write it down.

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So pretty simple.

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The first thing that will do right on field.

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So we are making a reference to matplotlib by writing down Kielty and the function that we are going

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to use will be blood.

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So basically Bluck right here and then we are going to write Xs here and our Y's here.

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So for the Xs, let's say it's going to be one, three and five.

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And for the guys, let's say it's going to be five, ten and twenty five.

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So basically we have just two numbers.

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If you guys want to add more, add more numbers.

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Let's say five.

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We have 10 in here.

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Let's say it's going to be one hundred and twenty five.

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All right.

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So basically, we have our numbers right here.

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But if we click on this little thing, it's not going to work because we didn't wrote down the function

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that will allow us to print everything right here.

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So to be able to see this graph, what we'll need to use is the show function.

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So it's going to be Kielty that show.

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And we want to see this what exactly we have just created.

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So pretty simple.

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You just write down to that show and you will be able to see the graph that you guys have just created.

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So basically we can compare to what we see right here.

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So we have one in here is going to be one four five.

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So with five is right here, then we'll have three.

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So three will be somewhere right here for ten.

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Then we'll have five for twenty five.

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So basically five would be somewhere here.

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So four twenty five makes sense.

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And finally ten for one hundred and twenty five which makes sense as well.

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So can see this is the graph that we have just created.

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So if we put our cursor right here, you can see down there everything is fine.

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So basically this is the first grab that we have created.

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All right.

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Right now, let's say that you guys want to have more than one line.

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So if for those who don't understand what I'm saying, so this would be one function.

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So this is just one function.

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Let's say you guys want to have more than one function.

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How exactly you can do all this?

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So it's pretty simple.

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There is another way to write it down.

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Usually we don't write that this way.

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So basically, this is just a presentation way.

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So just to present one chart or one graph.

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So the way that we are going to write everything down will be pretty simple.

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So we need our X's and our way.

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So basically X

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right there and are wise.

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So let's say we have to function.

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So it's going to be X and X one, Y one.

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So we'll have X to and Y to.

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So let's write it down, so if we're X1, what we'll do right now, we'll just add something.

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So let's say, for example, we want to add what we want.

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I will give them numbers.

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So it's going to be, let's say, two, four and eight and four.

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Why no one is going to be for eight and twenty four, for example, for the X number two is going to

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be pretty much the same thing.

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So let's say it's going to be three, six, nine and four y number two is going to be in this case,

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let's say 10, 15 and 30.

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Let's keep it like this so you can see the first thing that we will do usually will be write down our

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will want to write down.

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So basically all our database will be here.

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So all the X values and the Y values, then next thing would be writing down the plot, that plot function,

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for example, to the plot.

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And then what we want to do is show everything so that plot will have X and Y and find in the second

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one will be plot that blood X to Y two.

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So basically the the plot function will simply be the function that will allow us to work with that,

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let's say, for example, X and Y.

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So basically we want to work with X1 and Y one and we'll just write down X right here and wait right

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here.

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Same thing right there from the work with X2 and Y two.

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I'll just write down X2 and wait two.

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And finally, the last thing that we want to do is just show everything.

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So we'll write down that show and we can run our up.

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So basically what's going to happen is that we'll see are two lines right here so we can compare if

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it's what we have written.

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So this is exactly what we have written.

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So basically we have our first line right here.

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So four X one and Y one.

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It's blue and four x two, Y two.

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It's right there.

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If I change, for example, my thing right here instead of X to Y two, I just write down X and Y two.

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You'll see it's going to be a bit different.

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Because you can see became parallel because I'm working with two exes that are the same.

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So once again, this is more in mathematics, but as you can see, it works pretty well to be able to

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generate a graph.

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All right.

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So right now that we have our function, next thing that we want to do is write down, give a title

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to our graph.

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And not only this, we want to give a value to X and Y value to Y.

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So basically a title for X and it's a little too wide.

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So how exactly do we write all this down?

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It's pretty simple.

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So we'll just write down that title.

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So this will allow us to generate a title.

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So let's call it out on the list.

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Let's call it desk.

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So the title of our graph will be Test and then X values.

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We'll call it.

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Let's call it test X.

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So here we'll have built that X label.

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So basically we are giving a name to X labels, to the X, to the X value.

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So basically we'll call it, let's call it, as I said, test X values and plotty dot Y labels, which

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would be the name of the white labels would be test y values.

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So test y values.

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All right.

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So what I have just done right here, I just give a name to my access.

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So basically this would be the name of my axis and this would be the title of my chart.

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So everything what I did right now is pretty simple.

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So I still have the same, the same functions right here.

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So my functions are still the same.

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I just added a title and I added a axis name.

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So if I run everything, as you can see here, I have my chart name.

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So basically test, then I have text a test y values, which is my wife values and test X values, which

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are all my X values.

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So you can see it's pretty simple to understand.

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All right.

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Next thing that we want to do is pretty simple.

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We want to add to our graph.

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So we are graph right now is not that cool.

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So it's pretty simple, pretty well basic.

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If we want to add a little bit of style to our graph, it's possible there is a sub package of matlab

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called style and we can use it.

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So pretty simple.

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We'll just go here and we are going.

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So we need to import this sub package.

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So let's do it.

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Pretty simple right down from matplotlib.

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So we want to import stuff so the stuff package style.

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So right now we have our sub package.

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What we can do right now is just add some style to our graph or a chart and we can use the style that

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we want.

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So basically I have four styles that I can propose you basically they're all pretty.

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There are many more than four styles, but those are the four styles that are pretty simple to understand.

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So the function that we will use to to add style to our graph is just the style is just a use function.

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So basically we are going to make a reference to the style sub package and the use function.

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So basically it's going to be style that used and then we'll write down the name of our style.

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So basically, let's start with one of the styles that is called PMH, the image.

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So we say this is the first style that we are going to use.

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So right now we have added one style to our graph.

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So if we run everything, as you can see, the graph has another set.

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So basically right here, you can see there are squares.

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It's more cool if we don't use style.

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So basically, if we write down Classico, so it's going to be the basic the basic styles of classic

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and we run it.

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You'll see it's going to be a little bit different.

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So basically, it's a bit different.

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Everything here is great.

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The style is a bit different.

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There is another style that exists.

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It's called dark background.

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So basically we can try this one.

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So it's going to be dark here background.

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So back around here we go.

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And we can run it.

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So as you can see, this is another type of style that you guys can have.

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So basically the style function will just allow you to have to give certain a certain style to your

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graph.

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So I guess you should be able to create your own charts with matplotlib.

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So you can see it's pretty simple.

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The first thing that you guys do is import matplotlib library.

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Then if you want to add some style, just import the style, some package, then pretty simple, you

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just add everything.

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That you want a right here, so you create your you give to your X values, you give to your Y values,

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then you create your functions right here.

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So basically, this would be your database.

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This would be where you create your function.

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And finally, the last part is where you will get the title and the names to your access as well to

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your graph as well.

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That to your graph.

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So I hope you guys understand everything.

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So this are all the basics that you need to understand to be able to work with matplotlib.

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So it's a first class guys into all in our next class.