# MatplotLib - Customizing graphs
1) *change the color of the line*
x = [1, 2, 3]
y = [3, 4, 5]
/ run either one of the below lines to see the changes
plt.plot(x, y, "b") -> blue color line
plt.plot(x, y, "r") -> red color line
plt.plot(x, y, color = "black") -> another option
plt.show()
2) *changing the pattern of the line*
x = [1, 2, 3]
y = [3, 4, 5]
/ run either one of the below lines to see the changes
/ Here, the 1st letter is for color and the 2nd letter and onwards will be used for pattern types.
plt.plot(x, y, "ro") -> dot-like line
plt.plot(x, y, "r--") -> dashed line
plt.plot(x, y, color = "black", marker = "--") -> another option
plt.show()
Note: Check the documentation for more color options and pattern types
3) *changing the line width*
x = [1, 2, 3]
y = [3, 4, 5]
/ run either one of the below lines to see the output
plt.plot(x, y, color = "black", linewidth = 0.5) -> thin line
plt.plot(x, y, color = "black", linewidth = 5) -> thicker line
[plt.show](http://plt.show)()
4) *adding x and y label*
x = [1, 2, 3]
y = [3, 4, 5]
plt.xlabel("x")
plt.ylabel("y")
plt.plot(x, y, color = "black")
[plt.show](http://plt.show)()
Note: Make sure the values passed in xlabel() and ylabel() be inside " "
5) *adding the title*
x = [1, 2, 3]
y = [3, 4, 5]
plt.title("Demo")
plt.plot(x, y, color = "black")
[plt.show](http://plt.show)()
6) *adding names to lines and legends*
/ Adds a small description about the line the corner of the graph
a = [1, 2, 3]
a_sqre = [1, 4, 9]
a_cube = [1, 8, 27]
/ only adding label attribute won't do anything, make sure to call the legend()
plt.plot(a, a_sqre, color = "black", label = "a^2")
plt.plot(a, a_cube, color = "red", label = "a^3")
plt.legend()
plt.plot()
7) *changing the axis values*
x = [1, 2, 3]
y = [3, 4, 5]
plt.axis([0, 5, 3, 5]) -> pass a list in form of [x_axis_start, x_axis_end, y_axis_start, y_axis_end]
plt.plot(x, y, color = "black")
[plt.show](http://plt.show)()
8) *For a better understanding*
x = [1, 2, 3]
y = [3, 4, 5]
plt.plot(x, y, color = "black")
plt.grid() -> gives a grid-like structure in the background similar to the graph paper
[plt.show](http://plt.show)()
9) *Adding some details at a particular point*
x = [1, 2, 3]
y = [3, 4, 5]
plt.plot(x, y, color = "black")
/ font size is optional argument
/ syntax plt.text(x\_point, y\_point, "any text you want to add")
plt.text(1, 3, "Lowest value", fontsize = 10)
plt.text(2, 4, "Mid value", fontsize = 10)
plt.text(3, 5, "Highest value", fontsize = 10)
[plt.show](http://plt.show)()