Error using == Matrix dimensions must agree.

using this code to find the location of each element in the matrix

fn = 'FinalBookExcel.csv';

data = readmatrix(fn); % read the numeric matrix

lookupValue = 'Alternaria Leafspot'; % for example, find the location of all elements with value Alternaria Leafspot

[r, c] = find(data==lookupValue); % return row and column indices

But the following error appear after running this code

Error using ==

Matrix dimensions must agree.

Error in CSV (line 25)

[r, c] = find(data==lookupValue); % return row and column indices

Help me resolve this issue

Answer 1

[Ran Yang]

Use ismember instead of == .

[r, c] = find(ismember(data, lookupValue));

[Aiman Zara]

@Ran Yang used this but it didnot give me any output( resulted blank)

[Ran Yang]

Are you sure that your csv includes the exact phrase you're looking for?

Are you sure that it was imported correctly into Matlab? If you think you have text but only imported NaNs, see this answer to import as char and not numeric.