# What if the number of x values doesn't match the number of y values?

### Question

In Matplotlib, what if the number of x values doesn’t match the number of y values for our plot?

If the two values do not match dimensions, then this will usually end up in an error, and the graph not showing.

The dimensions of the x values must match the dimensions of the y values, meaning that they must have the same number of values passed in.

If using the Numpy library, you can obtain the shape of an Array using the `.shape` property.

``````Items = np.array([1, 2, 3, 4, 5])
Items.shape # (5, ) - which means a 1D array of 5 elements
``````
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if we’ve got a normal list will this work with the np library `.shape`? also would `len()` achieve the same results?

1 Like

Did you work out an answer to this?

why i cant use list comprehension instead of manually typing days = [1,2,3,4,5,6]

i could do days = [x + 1 for x in range(0,6)]

yeah, there’s lots of ways to do it, and if you had a much bigger number of observations it would make sense to use:

``````days = list(range(len(money_spent)))
# or more simply
days = list(range(7))``````