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I want to update my 'for loop'

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Hyerin Park
Hyerin Park 2020-9-28
编辑： Rohit Pappu 2020-10-28
Dear community.
I want to update my 'for loop' to get a full valid response.
for example, I want to get 5 'Space response time' regardless of some Invalid response(that didn't push space key at response phase)
so i put 'Invalid' variable to update 'TrialN', but it didn't work.
Here is my sample code.
Thanks a lot in advance for any idea...
trialtest = 5;
invalid = 0;
trialN = trialtest + invalid
spaceTime = 1.5
spaceKey = KbName('space');
tflip = [];
for T = 1: trialN
Screen('DrawLine',w, 0, cx-10, cy, cx+10, cy, 3);
Screen('DrawLine',w, 0, cx, cy-10, cx, cy+10, 3);
Screen('Flip',w);
WaitSecs(1); %초 생각해봐야 함
Screen('FrameOval',w,0,[cx-40,cy-40,cx+40,cy+40],4);
fixOnset = Screen('Flip',w,tflip);
[space spaceRT] = KeyResponse(spaceTime,0,spaceKey); % wait key to continue
mspaceRT = spaceRT*1000;
if space ==1
Screen('DrawLine',w, 0, cx-10, cy, cx+10, cy, 3);
Screen('DrawLine',w, 0, cx, cy-10, cx, cy+10, 3);
Screen('Flip',w);
DrawTextUni(w,['GOOD'],'center',0,-rect(4)*.3);
elseif space == 999
Screen('DrawLine',w, 0, cx-10, cy, cx+10, cy, 3);
Screen('DrawLine',w, 0, cx, cy-10, cx, cy+10, 3);
Screen('Flip',w);
DrawTextUni(w,['BAD'],'center',0,-rect(4)*.3);
invalid = invalid +1
end
trialN = trialtest + invalid % I put this code for update, but it doesn't work T.T
end

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回答（1 个）

Rohit Pappu
Rohit Pappu 2020-10-28
编辑：Rohit Pappu 2020-10-28
For loop does not support dynamic update of its conditions. A better alternative would be to use while loop instead
% Initialize t
t = 1;
while(t<=trialN)
% Block of code to be executed trialN times
t+=1; %Increment t
end

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