CODEWITHSUNDEEP
stringmatlabcell-array
user2860703
user2860703

Reputation: 483

concatenating cells in matlab with delimiter

This should be very simple. I have a cell array with two columns. One is numbers, and the other is colors. I want to concatenate these two columns into a single column separated by underscores. For example, I have something like this:

plant_tag = {3,'dark_blue';3,'dark_blue';3,'dark_blue'}

and I want something like this:

desired = {'3_dark_blue'; '3_dark_blue'; '3_dark_blue'}

I've looked here and other places How can I concatenate strings in a cell array with spaces between them in MATLAB?

Here's what I've tried so far

% Gives me errors
test2 = strjoin(plant_tag,'_');
test3 = strjoin(plant_tag(1,:),'_');
test4 = strjoin(cellstr(plant_tag(1,:)),'_');
test5 = strjoin(cellstr(plant_tag{1,:}),'_');

% No error, but misses number
test6 = [plant_tag{1,1} plant_tag{1,2}];
test7 = [plant_tag{1,:}];

I'm sure I'm missing something here--I apologize if it is something obvious

Upvotes: 1

Views: 873

Answers (3)

Luis Mendo
Luis Mendo

Reputation: 112689

Here's a vectorized solution:

desired = strcat(num2str([plant_tag{:,1}].'), '_', plant_tag(:,2));

Upvotes: 3

Benoit_11
Benoit_11

Reputation: 13945

With a good-old for loop:

clear
clc

plant_tag = {3,'dark_blue';2,'dark_red';1,'dark_green'}

desired = cell(size(plant_tag,1),1);
for k = 1:size(plant_tag,1)

   desired{k} = strcat(num2str(plant_tag{k,1}),'_',plant_tag{k,2});

end
desired

Output:

desired = 

    '3_dark_blue'
    '2_dark_red'
    '1_dark_green'

Upvotes: 2

TroyHaskin
TroyHaskin

Reputation: 8401

You can accomplish this using strcat (and also converting the 3 doubles to a string):

>> strcat( cellfun(@(c)num2str(c),plant_tag(:,1)) , '_' , plant_tag(:,2))

ans = 
    '3_dark_blue'
    '3_dark_blue'
    '3_dark_blue'

Upvotes: 2

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