"Index in position 1 exceeds array bounds" error for loop

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Atiqah Zakirah
Atiqah Zakirah 2019-7-20
编辑： Rik 2019-7-20
I'm trying to determine if there is a change in sign between the current and next value in my array (size is 2000 x 131) and count the number of times there is a change using a for loop as shown in the following code. The error lies in line "nextVal = brakingData(j+1,k)". I can't understand why this is an error. Why is the inital value of j 2000 when I run the loop? Shouldn't it be 1? How do I go about solving this error?
for k = 1:size(brakingData,2) %131
zeroCrossCount = 0;
for j = 1:length(brakingData) %2000
currentVal = brakingData(j,k);
nextVal = brakingData(j+1,k);
if ~isequal(sign(currentVal), sign(nextVal))
zeroCrossCount = zeroCrossCount + 1;
else
zeroCrossCount = zeroCrossCount + 0;
end
end
brakingFreqValue = zeroCrossCount/20;
brakingFreq(:,k) = brakingFreqValue;
end

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回答（1 个）

Rik
Rik 2019-7-20
编辑：Rik 2019-7-20
Instead of this line
for j = 1:length(brakingData)
Use this:
for j = 1:(size(brakingData,1)-1)
Although you can replace the loop with an array operation.

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