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match the first letter in a cell and save

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Vincent I
Vincent I on 12 Jun 2013
Hi, without using a loop for the cell I would like to the the following: I have a 5x1 cell and I would like to check to see if the first letter starts with an 'P'. if it does then I would like to save the cell to another variable eg:
variable<5x1 cell>=
A string 1 - cell 1
P string 2 - cell 2
P string 3 - cell 3
A string 4 - cell 4
P string 5 - cell 5
new_variable<3x1 cell>=
P string 2 - cell 2
P string 3 - cell 3
P string 5 - cell 5

Accepted Answer

Kye Taylor
Kye Taylor on 12 Jun 2013
Edited: Kye Taylor on 12 Jun 2013
Try this (I assume your cell is called variable)
idx = cellfun(@(s)strncmp(s,'P',1),variable)
newCell = variable(idx);
note that strncmp function is case sensitive so be sure you have 'P' and not 'p'. If you want to detect both lower and upper case p, use this command
idx = cellfun(@(s)strncmp(s,'P',1)|strncmp(s,'p',1),variable)

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