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Robert
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Find a value with cell array.

Asked by Robert
on 24 Feb 2015
Latest activity Commented on by Robert
on 25 Feb 2015
I'm using Matlab 7.14. I have a cell array with one column of numbers and one column of characters. i.e.
6 'text6'
5 'text5'
7 'text7'
3 'text3'
I want find a particular value (let's say 7) in the first column, and then use the reference to get at the text value in the same row (much like VLOOKUP in Excel). If this were just a numeric array I would use a = find(arrayname(:,1)==7) to get the row number (a would = 3) and then I could just get the text value via b = arrayname(a,2);
My question is how to find this reference/row number in my cell array? I've tried using a=cellfun(find(chart_list{:,1}==7)) but it returns the error 'Too many input arguments'. Can you use 'find' with cell arrays?
Any ideas how to find a value in an array?
Thanks Rob

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2 Answers

Answer by Jos (10584)
on 24 Feb 2015
 Accepted Answer

No need for cell2mat, simple concatenation would do:
val = [A{:,1}]
tf = val == 7
out = A(tf,2)
which you can do as a one-liner as well, of course:
A([A{:,1}]==7,2)

  1 Comment

Robert
on 25 Feb 2015
That works, thanks.

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Answer by Shoaibur Rahman on 24 Feb 2015
Edited by Shoaibur Rahman on 24 Feb 2015

A = your cell...
out = A(cell2mat(A(:,1))==7,2)

  1 Comment

Robert
on 25 Feb 2015
I get error 'Undefined function 'eq' for input arguments of type 'cell'.' if I use the code suggested. If I change the A(:,1) to A{:,1} I get the error ''== too many input arguments'. Jos's suggestion below seems to work though.
Thanks Rob

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