Extract and code gender string as number using if loop
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Jen
el 20 de Nov. de 2019
Comentada: Star Strider
el 21 de Nov. de 2019
I have data for 200 participants stored in a 1x1 structure with 3 fields (time data, gender and age). I'm trying to include lines of script that will extract the gender of each participant and code their gender as 0 (non-binary), 1 (female), or 2 (male). I'm also assigning an ID and extracting age, code so far is below:
for i = 1:size(files);
id = str2num(files(i).name(7:size(files(i).name,2)-4));
tempfile = load(files(i).name);
age = tempfile.data.age;
end
I don't have experience in using an if-loop on strings and am struggling to find the best command to use. I have tried the below, as this is what I would do if extracting and coding numbers, but obviously this doesn't work for these strings as they are not matched in size. I've also played around with STRCMP and STRNCMP but with no luck.
if tempfile.data.gender == 'non-binary'
gender = 0;
elseif tempfile.data.gender == 'female'
gender = 1;
elseif tempfile.data.gender == 'male'
gender = 2;
A little help would be much appreciated!
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Star Strider
el 20 de Nov. de 2019
I do not udnerstand the reason strcmp or strncmp would not work with your structure data. We may have to see ‘tempfile.data.gender’ in order to understand the problem.
Meanwhile, consider strcmpi to do case-insensitive comparisons.
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Bob Thompson
el 20 de Nov. de 2019
Just to clarify, you have 'gender' as two separate variables, once as a variable called 'gender' which will have a numeric assignment, and once as a field in a nested structure?
strcmp and == will ultimately have the same result, but you are going to run into the size issue on both of them. I work around this by having a second condition to be met for size.
if length(tempfile.data.gender) > 6 & tempfile.data.gender == 'non-binary'
gender = 0;
elseif length(tempfile.data.gender) > 4 & tempfile.data.gender == 'female'
gender = 1;
elseif length(tempfile.data.gender) == 4 & tempfile.data.gender == 'male'
gender = 2;
In a similar manner, if those are guaranteed to be the only possible responses, you can just use the size comparison to assign the value.
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