Octave: How can I create a string made from 2 strings and a variable?

Question

I want to for-loop through some values and for each value of the index I want to save an image to the disk. Is there a way to achieve the following:

N = 16;
name_RGB = ["RGBN" N ".jpeg"];

imwrite(image1, name_RGB, "jpeg");

??

So to explain, the loop is currently on index 16. I want to save an image with the name "RGBN16.jpeg". Anyone know if it is possible to join strings and variables together in Octave?

Possible duplicate of How do I concatenate a string stored in variable and a number in MATLAB — ederag
– ederag, Commented Apr 29, 2016 at 5:49
Look at newString = sprintf('%s %d', oldString, number) in this answer — ederag
– ederag, Commented Apr 29, 2016 at 5:51

gariepy · Accepted Answer · 2016-04-28 21:43:04Z

3

You just need to convert the numeric value to a string, then you can concatenate, like this:

N = 16;
name_RGB = ["RGBN" num2str(N) ".jpeg"];

imwrite(image1, name_RGB, "jpeg");

For more options, see the documentation here:

https://www.gnu.org/software/octave/doc/v4.0.1/Converting-Numerical-Data-to-Strings.html

answered Apr 28, 2016 at 21:43

gariepy

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3 Comments

whatwhatwhat Over a year ago

Literally just got it as you submitted the answer!!! Thanks for your troubles all the same :)

Andy Over a year ago

I would use something like fn=sprintf ("RGBN%i.jpeg", N);

Andy Over a year ago

@whatwhatwhat: Please consider accepting this as answer if it answers your question even if you found the answer yourself just before you read gariepys answer.

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