find beginning and end of events in a loop

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GB92_R
GB92_R 2023-1-11
回答： Divyanshu 2023-4-21
Hi,
i have the diameter left and right (DialL and DialR) and the variable TOBII_Stim (=Stimulus).
I am trying to extract the DialL and DialR that correspon to specific condtions presents in the variable TOBII_Stim. For example, i have to extract the diameter L and R that goes from the beginning of the condition "Croix grise 200" until the end of the condition "Croix grise 200".
to do so, i created two empy variables that i will fulfill with the index of my beginning and end condition:
index_trial=[];
index_trial_end=[];
for i=1:length(TOBII_Stim)
if TOBII_Stim(i) == "Croix grise 200.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "Croix grise 85.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "Croix grise 255.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "RichText4.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "RichText3.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "RichText2.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim(i) == "RichText1.rtf"
index_trial(end+1) = i;
end
end
i tried several things to find the end but i have errors saying that values must be integers.
Could please somebody help me out with understanding how to find the END of each condition and fulfill the variable index_trial_end=[]; ?
thnak you in advance
  2 个评论
Matt J
Matt J 2023-1-11
Please provide example input variables and the desired output.
GB92_R
GB92_R 2023-1-11
Hi Matt J,
i preferred to copy paste my work space to show you on which variable i am working on. I opened only DialL and TOBII stim to swhow you how they look like.
the objective is to fullfill the empty variable in this way:
for i=1:(length(index_trial)-1)
Trial{i}.index=index_trial(i);
Trial{i}.stim=TOBII_Stim(index_trial(i));
Trial{i}.baseline=(DiaL_LPF(index_trial(i)-65:index_trial(i)-1)+DiaR_LPF(index_trial(i)-65:index_trial(i)-1))/2;
Trial{i}.TIMEbaseline=TimeTOBII(index_trial(i)-65:index_trial(i)-1);
Trial{i}.timecourse=(DiaL_LPF(index_trial(i):index_trial(i)+1500)+DiaR_LPF(index_trial(i):index_trial(i)+1500))/2;
Trial{i}.TIMEtimecourse=TimeTOBII(index_trial(i):index_trial(i)+1500);
end
i=length(index_trial);
Trial{i}.index=index_trial(i);
Trial{i}.stim=TOBII_Stim(index_trial(i));
Trial{i}.baseline=(DiaL_LPF(index_trial(i)-65:index_trial(i)-1)+DiaR_LPF(index_trial(i)-65:index_trial(i)-1))/2;
Trial{i}.TIMEbaseline=TimeTOBII(index_trial(i)-65:index_trial(i)-1);
Trial{i}.timecourse=(DiaL_LPF(index_trial(i):end)+DiaR_LPF(index_trial(i):end))/2;
Trial{i}.TIMEtimecourse=TimeTOBII(index_trial(i):end);
%% save trials
save(Path_File(1:end-5),'Trial');

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回答（1 个）

Divyanshu
Divyanshu 2023-4-21
The reason for the error is that ‘TOBII_Stim’ is a cellular array and you are trying to access the elements of the cellular array using parenthesis () instead the cellular array elements should be accessed using angular brackets {}.
Have a look at the below sample code for better understanding:
index_trial=[];
index_trial_end=[];
TOBII_Stim = {"Validation.jpg" "RichText4.rtf" "Croix grise 200.jpg" "Croix grise 500.jpg" "Validation.jpg"}';
for i=1:length(TOBII_Stim)
if TOBII_Stim{i} == "Croix grise 200.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "Croix grise 85.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "Croix grise 255.jpg"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "RichText4.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "RichText3.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "RichText2.rtf"
index_trial(end+1) = i;
elseif TOBII_Stim{i} == "RichText1.rtf"
index_trial(end+1) = i;
end
end
index_trial
Please refer the following documentation for further information:
Access Data in Cell Array - MATLAB & Simulink (mathworks.com)

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