assign header line value to variable

I have a .vff file wich I open :

fid = fopen('test.vff');

The header is as follows:

ncaa;
rank=3;
type=raster;
format=slice;
bits=32;
bands=1;
size=256 256 256;

I want to extract size as a variable. So far I've tried:

size = fgetl(fid)

7 times in a row to get to the correct line, but the output I get is a char variable:

size = 

    'size=256 256 256;'

Instead of an array.

Thanks

CG

[Stephen23]

Do NOT use size as a variable name, as doing so shadows the very important size function!

Shadowing inbuilt functions is a common cause of bugs.

Answer 1

[Adam Danz]

Once you have that string, convert it to a vector like this.

s = 'size=256 256 256;'; 
s(~isstrprop(s,'digit')) = ' '; 
d = str2num(s)

% result
% d =
%   256   256   256

Option 2 (update after Stephen's good point below).

s = 'size=256 256 256;'; 
d = str2double(regexp(s,'\d+','match'))

Note that this will work even if the number of dimensions in 'size' changes (size = 256 256).

[Charles Gauthier]

It worked! Thanks

[Stephen23]

Note that str2num relies on eval.

Answer 2

[Stephen23]

A very simple and very efficient method without eval and without shadowing the inbuilt size:

>> str = 'size=256 256 256;';
>> vec = sscanf(str,'size=%f%f%f')
vec =
   256
   256
   256