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I have written a code that generates 20 strings (the number actually varies depending on the input), all of which have the names "s_idx_?" where ? is a number from 1 to 20. Is there a command that allows me to concatenate all these strings without having to type out all the names? Thanks.

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Nathan Greco
Nathan Greco 2011-7-19
First: it is generally nicer to create one data structure to contain all of these strings rather than creating a variable per string. Look up cell arrays, they are your friend. Rather than calling your strings s_idx_?, you could just call them s{?} where ? is your old number.
E. Elgar
E. Elgar 2011-7-19
Actually I'm oversimplifying the problem a bit. This is the code I have:
for e = 1:length(c)
f = eval(c{e}); % for each c, f gives the list of cues under the condition
for g = 1:length(f) % runs through the whole string of cues (f)
i = f{g};
h = genvarname('s_idx_',who);
eval([h '= find(strcmp(''' i ''',theData.study.cue))']); % matches each i with a number from some list I have
end
end
The output is a bunch of variables called "s_idx_?". The number of variables will change if I change the input. I've tried creating cell arrays as Nathan suggested, but it doesn't seem to work.
Sean de Wolski
Sean de Wolski 2011-7-19
POISON!! EVAL!! Don't do it!!
E. Elgar
E. Elgar 2011-7-20
!! Other solutions then?

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Sean de Wolski
Sean de Wolski 2011-7-19

1 个投票

FAQ4.6
Don't do it!
but if you have to:
sprintf('s_idx_%i\n',1:20)

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Jan
Jan 2011-7-20
I agree with "Don't do it". The SPRINTF command concatenates the _names_ of the variables?! The OP wants to cat the string values.

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Jan
Jan 2011-7-20

2 个投票

Follow Sean's link to the FAQ. There you find the suggestion to use a cell like "s_idx{i}" instead of including the index in the name of the variables. Thjen the concatenation is easy:
s = cat(2, s_idx{:});

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