# How to start analysing data from the highest value from excel?

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Alexander on 6 Dec 2014
Commented: Jos on 7 Dec 2014
Hello,
I have an excel file with all my data from different files, and I would just like to make it so that the data points I use for calculations start from the highest value of the data points.
experimentData = xlsread('Healthy_original.xlsx'); %Change for each experiment
t=experimentData(1:500,1);
for i=1:10 %start of loop
a=experimentData(1:500,1+i);
%%loop continues
Is there a way to get it so that the highest value of the data is taken to be the first point, everything before the highest point is irrelevant.
Thanks for any help

Jos on 6 Dec 2014
Hi Alexander,
I'm not entirely sure this is what you're looking for but I assume you want the vector 'a' within your for loop to start from the highest value in that particular column. To do this you can find the indices of the highest values in each column before the for loop
[~, indices] = max(experimentData(1:500,:));
then within the for loop you can use your data from the highest value by
a = experimentData(indices(i):500,1+i);
Cheers
Joe
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Jos on 7 Dec 2014
the function max() creates two vectors if you use it on a matrix, a vector containing the maximum values and a vector containing the associated indices of these values. You can get both vectors by using
[max_values, indices] = max(experimentData(1:500,:));
In the case above I was only interested in the indices of the maximum values, therefore I used ~ instead of max_values which basically means the first output vector will not be generated