Create an array from another and find the indices.
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Hi everyone,
I have an array with variables like S,SV, V etc now I want to create a new array only with the V variable so for example;
V
SV
S
V
will become
V
V
after this I need to know the indices where I found each one of the V variables, so in this example I should get Indices = 1 and 4
Thank you for the help.
2 Comments
Walter Roberson
on 11 Feb 2014
Are those strings, or are they numeric values? If they are numeric values, are they scalars or vectors or arrays? If they are vectors or arrays are all of them the same size?
Accepted Answer
Jos (10584)
on 11 Feb 2014
MySet = {'S' 'V' 'SV' 'S' 'V' 'V' 'S' 'SV' 'V'}
MyStr = 'V'
tf = strcmp(MySet, MyStr)
index = find(tf)
KeepSet1 = MySet(tf)
KeepSet2 = repmat(MyStr,1,numel(index)) % same result
2 Comments
Jos (10584)
on 11 Feb 2014
Oh, I made a small mistake. I just wanted to point out that what you want to keep are only the V's. There are numel(index) elements to keep. These elements can be retrieved from MySet using the Index OR by repeating the element a number of times. The correct code, however, is:
KeepSet2 = repmat({MyStr},1,numel(index)) % between { }
More Answers (2)
David Sanchez
on 11 Feb 2014
most_common_string = {'V','SV','S','V','S'};
wanted_string='V';
idx = getnameidx(most_common_string,wanted_string);
idx = find(most_common_string==wanted_string);
k=1;
for i=1:numel(most_common_string)
if most_common_string{i} == 'V'
periodo(k)=i;
k = k+1;
end
end
periodo =
1 4
new_string_array = most_common_string(periodo);
new_string_array =
'V' 'V'
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