CODEWITHSUNDEEP
matlabmatchcell-array
chris
chris

Reputation: 300

replacing values in a cell array for matching values from another

There is a cell array in MATLAB

B = 

    [ 1708]    [ 2392]    '+'
    [ 3394]    [ 3660]    '+'
    [ 5490]    [ 5743]    '+'
    [ 7555]    [ 7809]    '-'
    [ 9256]    [ 9509]    '-'
    [12878]    [15066]    '-'
    [16478]    [17458]    '-'

and another cell array

C = 

[4]
[7]
[1]
[6]
[2]
[5]
[3]

I want to replace the values in C with the values in B{...,3} such that C becomes

C = 

    '-'
    '-'
    '+'
    '-'
    '+'
    '-'
    '+'

How can I do that in MATLAB? I currently did this but got error

>> C(C == 'x') = B
Undefined function 'eq' for input arguments of type 'cell'.

Upvotes: 0

Views: 917

Answers (3)

chappjc
chappjc

Reputation: 30579

Horizontal concatenation ([]) with comma-separated list cell array output ({:}) gives a direct way to index the appropriate rows in B:

Cnew = B([C{:}],3)

Upvotes: 3

Floris
Floris

Reputation: 46365

You could try

C = cellfun(@(x)B(x,3),C);

This addresses the problem you were seeing with C no longer being a cell array - note the subtle difference between B{} and B().

Upvotes: 2

Daniel
Daniel

Reputation: 36710

Basic indexing, to get the elements of X in the order a=[1,3,2,4] use X(a). Indices are matrices, thus a conversion is needed, nothing else. 

B(cell2mat(c),3)

Upvotes: 1

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