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?

CodePudding user response：

As you wrote, one way would be to convert B back to a numeric array. The other way, i.e. using the condition directly on the cell array, is possible with the cellfun function:

isSmaller = cellfun( @(X) X < 0.0038, B(:), 'UniformOutput', true )
numSmaller = sum(isSmaller)

Explanation:

• cellfun applies the anonymous function @(X) X < 0.0038 on all cells of B.
• It stores the results in the array isSmaller.
• 'UniformOutput', true triggers that isSmaller is a numeric array. To store the results in a cell array you could use 'UniformOutput', false.

Remark: As beaker commented, in your example it is not necessary to convert randn(41) to a cell array in the first place. You could store it as a numeric array and apply the condition directly on the array. However, I assume that your example is meant as minimum working example (MWE).