Matching first n characters of string in array

Hi,

My data is organized in the following way:

image1_control
image1_drug
image1_drug2
image2_control
image2_drug2
image3_control
image4_drug
image4_drug2

etc

with each "image" file as a structure containing all information about the image.

I would like to write a function that allows me to group each image, with its various conditions, into a cell array.

I tried using strcmp but it would require pairwise comparison of each string.

Can you please help?

Thank you!

[Merged from duplicate]

Hi,

My data looks like this:

image1_control,
image1_drug,
image1_drug2,
image2_control,
image2_drug2,
image3_drug,
image4_control,
image4_drug2,

etc

These are all field names of a structure containing all the "images".

I would like to group each image and its various conditions based on the field name.

I have tried using strcmp, but I would have to create a for loop to conduct a pairwise comparison. I'm having trouble using regexp and indexing all "images" with the matching names.

Can someone help me find a more efficient way to group field names that contain matching first 7 letters?

Thanks!

Answer 1

[KSSV]

str = {'image1_control','image1_drug','image1_drug2','image2_control','image2_drug2',.......
'image3_drug','image4_control','image4_drug2'} ;

%%Seperate drug
idx1 = strfind(str, 'drug');
idx1 = find(not(cellfun('isempty', idx1)));
str1 = str(idx1)
%%Seperate control
idx2 = strfind(str, 'control');
idx2 = find(not(cellfun('isempty', idx2)));
str2 = str(idx2)