Matplotlib is how we plot our devious plots. Mostly in the form of functions.
Import matplotlib.pyplot as plt
plt is the standard alias
Drawing
for matplotlib to draw us our function, we need to give it the x and y values first. Define a range of x and put it into a y value funciton then input into matplotlib
my y function is just x^2 so it will be a parabola. To run these into matplot, just do plt.plot(x,y) and then show the graph using plt.show()
We can also plot multiple graphs on the same axis. Just do another plot with a different function.
Now on run, it looks like this:
fun feature of color
We can have fun with the graph plot. Give it some styles like red graph, blue graph, black graph
thats a red graph
thats a dash red graph
thats a dotted green graph
thats a triangle dotten yellow graph’
subplots
You have several plots inside one window.
plt.subplot(NumrowNumcolumnIndex) the reason why that parameter is like that is because you just give it one integer, but the integer has 3 digits. The firs digit is the number of rows to subplot, the second is the number of columns to subplot, the third is what index am i
first 2 digits don’t change for subplot, only 3rd does because index always differs. You must store this subplot as a variable, then variable.plot(x,y) to plot.
also use plt.tightlayout() before show to make it look nicer
Multiple windows(figures)
simply do np.figure(fignum) and then do all your plotting below it, then if you want another window, do another figure, so on so forth
Pie charts
The simplest rendition of the pie graph is just pass it a single number list. plt.pie(numlist)
to give it labels: plt.pie(numlist,labels=labelslist)
to give it percents, you do plt.pie(numlist,labels=labelslist,autopct=’%.2f%%\’) to show it at 2 decimal places
3d Graph
We want to plot a 3d graph. To do this, we must first import another library from mpl_toolkits.
From mpl_toolkits import mplot3d
this is the most rudimentary way to show a 3d grid
then lets get our table of values, xyz axis all 3.
then just do ax.plot3D(x,y,z)
Some graphs are surfaces, not points. To graph this, we must have our xyz table of values, but have one plane be a matrix, then just ax.plot_surface(X,Y,Z)
