adding space before capital letters in variable names

if I'm converting a variable name to a string in a function, how can I put a space before every capital letter in the input variable? eg, if the input is:

varNameOne

how can I convert this to

var name one

for formatting legend entries?

[Jan]

Please use meaningful tags only. I do not see a connection to "legends" or "varargin" here.

Answer 1

[Image Analyst]

Thinking that this may be homework, here's a hint:

s = 'varNameOne'
upperCaseIndexes = s >= 'A' & s <= 'Z'

Some related File Exchange submissions:

splitstring

allwords

Answer 2

[Daniel Shub]

You can use REGEXPREP. To just add a space before every uppercase letter

regexprep('varNameOne', '([A-Z])', ' $1')

To add a space before every uppercase letter and convert that letter to lower case

regexprep('varNameOne', '([A-Z])', ' ${lower($1)}')

Answer 3

[Ryan G]

Try the code in this thread:

% a string
   s='varNameOne';
% the engine
   ix=ismember(s,'A':'Z');

Then input the space (credit to Walter from a newsgroup thread circa 2008)

V = s;
P = find(ix==1)-1;
N = ' ';
for i = 1:numel(P)
 V = [diag(kron(V.',ones(1,P(i))));N;flipud(diag(kron(flipud(V.'),ones(1,length(V)-P(i)))))].'
P = P+1;
end

[Walter Roberson]

I wrote that?? I must have been frustrated with someone and deliberately being obscure...

[Image Analyst]

Wow - clear as mud to me!

Answer 4

[Jan]

S  = 'varNameOne';
up = isstrprop(s, 'upper');
T  = blanks(length(S) + sum(up));
T(cumsum(up + 1)) = lower(S);

Answer 5

[Jan]

Actually I assume that this is a homework, too. It will not be easy to submit one of these solutions without cheating. And of course your teacher knows this forum also. Nevertheless, it is a funny problem and I think, if you spend the time to find out, how each of the solution works, you will have learned enough for today. But do not expect, that we solve homeworks in general.

S           = 'varNameOne';
T(1, 2:end) = lower(S);
T(2, isstrprop(S, 'upper')) = ' ';
T = reshape(T(~~T)), 1, []);

[Daniel Shub]

I interpreted the for "formatting legend entries" part of the question as meaning it was not homework. Most doit4me questions aren't creative enough to come up with a reason to want what they are asking for.

[Sara]

No, this isn't homework. It's part of a function which turns takes the name of input variables and uses that to create legend entries and filenames (no, NOT dynamic variable names). I wrote another question about five minutes before this one which gave more background detail, but accepted an answer too quickly. The input variable names do use varargin, and this IS for formatting legend entries automatically, but I see your point about tags.