spm_get, spm_select, and char

The mostly used functions I use in SPM is spm_get (for spm2) and spm_select (spm5 and 8).  These two functions are used to get files (usually image files). Frankly speaking I like spm_get much better as it’s intuitive and easy to use. Here is how to use them:

Select some image files interactively (a window pops up and users select),

    p = spm_get([],'*.img','Select the image(s)');
    p = spm_select([0:200],'IMAGE','Select the image(s)');

Select some files automatically,

    p = spm_get('files', pwd, '*.img');
    p = spm_select('list', pwd, '.*img');

The filter in spm_select is different from that in spm_get. In spm_get, the filter is traditional linux/windows file filters such as *.img, ???.hdr etc. In spm_select the filters are regular expressions. For example, to get all files starting with I and end with .img, you put something like ‘^I.*\.img’.

To concatenate two file lists vertically, you can use char function:

    p = char(p1, p2);

char will automatically fill blanks so p1 and p2 are of the same columns to be vertically concatenated.

Below are more examples of spm_get and spm_select:

% select some files interactively and save the file names into a variable P
P = spm_get
% select 6 (not 5, not 7, exactly 6) files interactively
P = spm_get(6)
% select 2 to 4 files interactively
P = spm_get([2:4])
% select 0 to 8 files interactively
P = spm_get([0:8])
% automatically get all imaging files in the directory c:\abc
P = spm_get('Files', 'c:\abc', '*.img')
% automatically get all mat files starting with e in the current working directory
P = spm_get('Files', pwd, 'e*.mat')
% automatically get the mat files in the directory c:\abc which satisfy the following condition: the file names end with f and another two characters. Pay attention to the usage of * and ?
P = spm_get('Files', 'c:\abc', '*f??.mat')
% select some (<200) folders interactively. Now you see, negative numbers means to select folder instead of files
P = spm_get([-200:0])

% select some files interactively and save the file names into a variable P
P = spm_select
% select 6 (not 5, not 7, exactly 6) files interactively
P = spm_select(6)
% select 2 to 4 files interactively
P = spm_select([2 4])
% automatically get all imaging files in the directory c:\abc. Files are saved in P and directories are saved in dirs
[P, dirs] = spm_select('list', 'c:\abc', 'img')

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