concatenation between variable and string

Question

I am trying to concatenate a variable with a string. For example I want to get d1, d2 and d3.

I know that to concatenate 'd' with 1 , 'd' with 2 and 'd' with 3 , it is necessary to convert 1, 2 and 3 to string. The code below work very well :

['d' num2str(1)] = 4;
['d' num2str(2)] = 5;
['d' num2str(3)] = 6;

But when I tried the code below:

for i=1:3
['d' num2str(i)] = i+3;
end

Unfortunately I always get the error : An array for multiple LHS assignment cannot contain LEX_TS_STRING

Any help will be very appreciated.

This is very strongly discouraged by everyone, including Mathworks. It's much better to use d(1), d(2) etc. Of course, if you're writing this to a file and have to have it on this format, I guess you can't avoid it. However, I would still recommend keeping it on the format d(ii) in MATLAB, and use evalc() when you're writing it to the file. — Stewie Griffin
– Stewie Griffin, Commented Mar 8, 2014 at 11:48

Divakar · Accepted Answer · 2014-03-08 11:35:33Z

3

Use EVALC -

for i=1:3
    evalc(['d' num2str(i) '=' num2str(i+3)]);
end

EDIT 1: If d1=3; and you need to get d2 = d1+4 and d3 = d2+4;, use this -

d1 = 3;
for i=2:3
    evalc(['d' num2str(i) '=d' num2str(i-1) '+4']);
end

edited Mar 8, 2014 at 11:35

answered Mar 8, 2014 at 11:17

Divakar

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2 Comments

Christina Over a year ago

And if I have for example d1=3; and I want to get d2 = d1+4 and d3 = d2+4; how to edit your code. Please can you add this to your code above ? thanks in advance

Christina Over a year ago

I get Undefined function or variable 'd2' and 'd3' :)

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