Width function on arrays

How do i use the width or height functions on a 3d array? For example, the array information i am using is that of a picture.

Answer 1

[Stephen23]

MATLAB does not have width or height functions for normal arrays. You can use size to get the size of an array:

d = size(X)
[m,n,p,~] = size(X)
m = size(X,dim)

You can select the dimension using the optional second argument:

rows  = size(X,1)
cols  = size(X,2)
pages = size(X,3)

You might like to read about multidimensional arrays to know how these are defined and accessed.

For the new data class tables you can use the width function to get how many variables there are in the table, and height to get the number of rows of the table.

[Walter Roberson]

Caution: if X is 3 or more dimension, then

[m,n] = size(X)

will return unexpected values in "n"! Be sure to read the documentation for size() for what it does when there are multiple outputs.

[f]

Just for future reference: as of R2020b, I think width and height have been added for arrays: https://it.mathworks.com/help/matlab/ref/width.html?s_tid=srchtitle

[Stephen23]

Indeed, just added to the latest release: https://www.mathworks.com/matlabcentral/discussions/highlights/133276-new-in-r2020b-new-way-to-return-height-or-width-of-arrays