How to apply a relational operator on a cell in MATLAB?

I would like to know the number of values that are less than 0.0038 in a cell of 41 X 41 double.

For example, I have the cell below:

B = num2cell(rand(41));

When I applied such condition

sum(A(:) < 0.0038)

, it gave me an error, which is Operator '<' is not supported for operands of type 'cell'.

So, do I need to convert the cell to a matrix and apply the operation? Or is there any specific way to use this condition on the cell directly?

[Stephen23]

B = num2cell(rand(41));

Why use such an inefficient approach to storing numeric data?

Most likely your task would be much simpler if you used a numeric array.

[Star Strider]

‘Or is there any specific way to use this condition on the cell directly?’

Yes.

Answer 1

[Star Strider]

Use the cellfun and nnz functions —

B = num2cell(rand(41));
A = nnz(cellfun(@(x)x<0.0038, B))

A = 5

.

[Haitham AL Satai]

@Star Strider I really appreciate your answer, but it did not work. It asked me first to change 'UniformOutput' to false and when I changed it, I faced this error (Incorrect number or types of inputs or outputs for function 'nnz'.) because my size data type is double.

[Stephen23]

"It asked me first to change 'UniformOutput' to false "

Your actual cell content are non-scalar, unlike the example data you gave in your question. An inaccurate data description in your question delays you getting a useful answer that works on your actual data.

What do you expect SUM to return for a set of arrays (potentially of different sizes) ?

[Star Strider]

@Haitham AL Satai — My pleasure!

@Stephen23 — Thank you!

[Haitham AL Satai]

@Stephen23 Thank you for your notice. I got it now. Thank you again.