calling a sequence of images for processing

I have a part of my code shown below which allocates the file name of a sequence of images so that it can be read with the imread command but for some reason it adds a space inside the file name so the name is invalid:

if k ~= 1
        if k < 10
            num = k - 1;
            file_num = strcat('0',num,'.')
        else
            file_num = strcat(num,'.');
        end
        image_file_name = strcat(file, image_name, file_num,'jpg');
        M = imread(image_file_name);
    else
        file_num = '00';
 end

And it gives me the error:

Error using imread (line 350)
File "C:\Users\bostock_h\Documents\Images\i130614_075_large\i130614_074-1000 .jpg" does not exist.

Error in image_processing_project4 (line 61)
        M = imread(image_file_name);

So as you can see there is a break after the file number with a space. But I don't know where it's coming from??

Answer 1

[Matt J]

Perhaps you meant

num = num2str(k - 1);