sivasudhan - 6 months ago 29

Python Question

I am trying to plot

`(x,y)`

`y = [[1,2,3],[4,5,6],[7,8,9]]`

Say,

`len(x) = len(y[1]) = len(y[2])`

The length of the y is decided by the User input. I want to plot multiple plots of y in the same graph i.e,

`(x, y[1],y[2],y[3],...)`

`dimension error`

I also tried:

`plt.plot(x,y[i] for i in range(1,len(y)))`

How do I plot ? Please help.

`for i in range(1,len(y)):`

plt.plot(x,y[i],label = 'id %s'%i)

plt.legend()

plt.show()

Answer

Assuming some sample values for x, below is the code that could give you the desired output.

```
import matplotlib.pyplot as plt
x = [1,2,3]
y = [[1,2,3],[4,5,6],[7,8,9]]
plt.xlabel("X-axis")
plt.ylabel("Y-axis")
plt.title("A test graph")
for i in range(len(y)):
plt.plot(x,[pt[i] for pt in y],label = 'id %s'%i)
plt.legend()
plt.show()
```

Assumptions: `x`

and any element in `y`

are of the same length.
The idea is reading element by element so as to construct the list `(x,y[0]'s)`

, `(x,y[1]'s)`

and `(x,y[n]'s`