My mesh grid is giving me a value not a matrix

I put in the code x=[-5.0e-9:5.0e-9] and y=[-5.0e-9:1.0e-9] and [X,Y]=meshgrid(x,y) and it just gives me -5.0000e-9 instead of a matrix, what am I doing wrong

Answer 1

[Dave B]

The question is: how many points do you want in your grid?

The : operator, by itself, takes increments of 1:

5:10

ans = 1×6

5 6 7 8 9 10

The min and max in your x are (much) less than one apart, so x and y are scalars, so your grid is a scalar:

x=[-5.0e-9:5.0e-9] 

x = -5.0000e-09

y=[-5.0e-9:1.0e-9] 

y = -5.0000e-09

You could specify a spacing like this:

x=-5.0e-9:1e-10:5.0e-9;
size(x)

ans = 1×2

1 101

size(meshgrid(x,x))

ans = 1×2

101 101

Or a number of points like this:

x=linspace(-5.0e-9,5.0e-9,50);
size(x)

ans = 1×2

1 50

size(meshgrid(x,x))

ans = 1×2

50 50