For loop over writes output with strcmp

Hello,

I have the following code. The probles is that for every for loop, there are mulitple occurences of firsy in second. So, after every run, L is over written. I would like the indexesfor of anything that matches to be added below the previous output of L, not overwritten. I tried a lot of things but couldn't figure this out. Please help.

for a=1:r
first=test1(a,1);
second=reactionType(:,3);
L=find(strcmp(second,first));
end

[Michael Madelaire]

Would be real nice if you told what

test1
reationType

is...

[Ishita Trivedi]

they are both cell arrays of varying columns and rows containing mixed data (numbers and strings). test1 is basically my input array that where the 1st column needs to be cross-checked against the 3rd column of reactionType array for any matches. Then I need the index of those matches.

Answer 1

[madhan ravi]

L=cell(1,numel(r)); % before loop (preallocation)
L{a}.... inside loop
 ^^^---just add this rest the same
celldisp(L) % after loop (to see the contents of L)

[Ishita Trivedi]

Okay that worked. However, now L is a cell array (1,r) where:

If there is data, the cell is a 11x1 double (for example) and if there is no data, i see [ ] (meaning blank or no matches were found).

Is there a way to trim L to only save cells where there is data and ignore the rest?

[madhan ravi]

idx=~cellfun('isempty',L);
L(idx) % this will avoid all the empty arrays

[Ishita Trivedi]

I am sorry for my dumb questions but I am just learning matlab as I work on this. So I don't quite understand where to add this line?

[madhan ravi]

Don't be sorry , at the end of the code.

[Ishita Trivedi]

This worked perfectly. Thank you so much.The three things I am struggling with in matlab is learning how to use textscan, format (when using text scan) and cellfunc properly.

I am sure it will be easier once I get better at this. But thank you for helping.

[madhan ravi]

Anytime :) , read the documentation of textscan() it has plenty of examples.

[Ishita Trivedi]

Thank you!

I actually have a follow up. When I store the index of all matches in L{a} - in column 2 of L{1,1} (for example),how can I also store the input value from test_1 that is being compared to the master library reactionType inside for loop?

index comes from master library and input from test_1.

[madhan ravi]

just preallocate as shown in the answer and follow it

[Ishita Trivedi]

Hello,

The problem I am encountering here is how to have string at L{1,1}(1,2) while L{1,}(1,1) is a number?

I keep getting NaN.