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Error in locating a reference cell for calculations

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Adrienne
Adrienne 2014-5-14
关闭： MATLAB Answer Bot 2021-8-20
So far I have got this code:
%%=================================================
%%to find average power first use "find" function to find the first zero in
%%Fz, have the cell referenced
%%then use nanmean for average power(av_pwr)
%%use nanmin for peak power (peak_pwr)
%%=================================================
ref= find(data{i,1}(:,5)==0);
ref=ref(1);%returns all times zero occurs then extracts first time data is 0
peak_pwr(i,1) = nanmin (data {i,1}(1:ref,5));
%preak power in coloumn E1 in all data with reference to cell found
av_pwr(i,1)=nanmean(data{i,1}(1:ref,5));
%average power in coloumn E1 in all data with reference to cell found
I have tried to locate the first zero in column E1 and then use this as a reference cell to get the peak and average power. However it is coming up with this error:
Attempted to access ref(1); index out of bounds because numel(ref)=0.
Error in code (line 53) ref=ref(1);%returns all times zero occurs then extracts first time data is 0
anyone know how to get around this?

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回答（1 个）

David Sanchez
David Sanchez 2014-5-14
If you read the line:
Attempted to access ref(1); index out of bounds because numel(ref)=0.
you can see that
data{i,1}(:,5)==0
is never fulfilled and therefore, ref remains an empty array with no values in it.
When you tried to access its first value:
ref=ref(1)
the system complains (yields an error) because there is nor such an element. Since I do not have data, it is nor easy to tell whether any of its elements equals 0 in any moment.
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Adrienne
Adrienne 2014-5-14
(i) is for the loop so that it stores the information rather than write over it each time as I have to know all the data for each 81 jumps. i had trouble reading them in so I had to do it like this:
i=1:njump;
x=sprintf('Trial%02d.csv',i),sprintf('Trial%02d',i),'A1:E7000';;% jump data
data{i}=xlsread(x,'A1:E7000');
% code
end

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