filtering MATLAB results with strfind

myver = ver;
myver(1:5).Name

returns:

ans = 'Computer Vision System Toolbox'
ans = 'Control System Toolbox'
ans = 'Curve Fitting Toolbox'
ans = 'DSP System Toolbox'
ans = 'Database Toolbox'

Stringfind

strfind(myver(1:35).Name,'Toolbox') 

Returns the error:

Error using strfind
Unrecognized parameter name 'Curve Fitting Toolbox'.

I am seeking a list of all entries with the word 'Toolbox'. Why does strfind err on the third entry?

Any feedback or edits that sharpen the question are appreciated.

1 Answer

myver(1:5).Name returns a comma-separated list.

strfind(myver(1:5).Name,'Toolbox') is the same as:

strfind('Computer Vision System Toolbox', 'Control System Toolbox', ... 'Curve Fitting Toolbox', 'DSP System Toolbox', 'Database Toolbox', 'Toolbox');

Clearly this is invalid syntax. Read the documentation of the strfind function to see the valid syntax.

You need to combine this comma-separated list's elements in a cell-array before applying strfind i.e:

tmpVar = {myver(1:35).Name}; %concatenating the list into a cell-array
check = strfind(tmpVar,'Toolbox'); %finding which cells contain 'Toolbox'
logidx = ~cellfun(@isempty,check); %logical indices of the cells which contain 'Toolbox'
tmpVar{logidx} %Required result (as a comma-separated list)

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