joining a character variable and a numerical variable to call a filename within a loop

how do i join the variable n to the variable filename to get the name of a real file that i want to call in a loop?

example

real files called: file 1, file 2 etc..

filename='file';

n=1:5;

for

some action filename + n;

end

many thanks

James

Answer 1

[Robert Cumming]

there are lots of ways to do this, see num2str or using low level sprintf, a few examples:

fname = [ filename num2str(n) ];

fname = strcat ( filename, num2str(n) );

fname = sprintf ( '%s %i', filename, n );

I always use the last example

[m naveed]

hi @Robert Cumming...i am using a nested for loop to place simulink blocks to form a 4 X 4 mesh of same element in combination with add_block and add_line function. how should i use num2str to name my elemens in the row differently than the elements in columns. e.g. for row elements, the blocks should bear the names B11 B12 B13 B14 and the next three rows should follow as...B21 B22 B23 B24 and so on until the 4x4th element to be B44

Answer 2

[Jan]

See also the FAQ:

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

It is alway a good idea to look for an answer there before asking here.

[james]

I had a crack at searching for an answer, obviously I used the wrong search terms. When you don't have the right 'code' vocabulary it's not as easy as you think to find what you want.

I think I searched something like -joining variables? I Had a go with num2str but didn't quite use the right syntax.

I have banged my head on the desk in punishment :)

[Jan]

Take all the terms you have searched for and set them as tags to your question here, such that others will find it fast. You are not allone with this problem - otherwise it would not be in the FAQ...

Answer 3

[james]

Hi robert

thanks for your reply

i had been playing with num2str and sprintf but to no avail!

James

[Robert Cumming]

why not? What error are you getting?

Post some code.

[james]

all your answers work fine

it was my random combinations of num2str and sprintf that didn't work. sorry i should have been more clear