Python uses matplotlib to plot the sine and Cosine curves, pythonmatplotlib

Python uses matplotlib to plot the sine and Cosine curves, pythonmatplotlib

This example describes how to use matplotlib to draw a sine and cosine curve in Python. We will share this with you for your reference. The details are as follows:

1. Introduction

Keywords: Drawing Library

Official Website: http://matplotlib.org

Code 2

Import numpy as npimport matplotlib. pyplot as plt # linex = np. linspace (-np. pi, np. pi, 256, endpoint = True) # define the cosine function sine function c, s = np. cos (x), np. sin (x) plt. figure (1) # drawing, x as the abscissa, and c as the ordinate plt. plot (x, c, color = "blue", linestyle = "-", label = "COS", alpha = 0.5) plt. plot (x, s, "r *", label = "SIN") # Add the title plt. title ("COS & SIN") ax = plt. gca () ax. spines ["right"]. set_color ("none") ax. spines ["top"]. set_color ("none") ax. spines ["left"]. set_position ("data", 0) ax. spines ["bottom"]. set_position ("data", 0) ax. xaxis. set_ticks_position ("bottom") ax. yaxis. set_ticks_position ("left") plt. xticks ([-np. pi,-np. pi/2, 0, np. pi/2, np. pi], [R' $-\ pi $ ', R' $-\ pi/2 $', R' $0 $ ', r' $ + \ pi/2 $ ', R' $ + \ pi $']) plt. yticks (np. linspace (-1, 1, 5, endpoint = True) for label in ax. get_xticklabels () + ax. get_yticklabels (): label. set_fontsize (16) label. set_bbox (dict (facecolor = "white", edgecolor = "None", alpha = 0.2) # The Legend displays plt. legend (loc = "upper left") # display the grid plt. grid () # display range # plt. axis ([-0.5,-, 1]) plt. fill_between (x, np. abs (x) <0.5, c, c> 0.5, color = "green", alpha = 0.25) t = 1plt. plot ([t, t], [0, np. cos (t)], "y", linewidth = 3, linestyle = "--") plt. annotate ("cos (1)", xy = (t, np. cos (1), xycoords = "data", xytext = (+ 10, + 30), textcoords = "offset points", arrowprops = dict (arrowstyle = "-> ", connectionstyle = "arc3, rad =. 2 ") # displays the drawing plt. show ()

Three running results