How to create a matrix from a vector using specified values

2015 11 3
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更新时间：2015 11 3
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I have a column of hip angle data from a treadmill walking trial (roughly 1 min) with a length of 12113 elements. I have identified heel strikes in a separate vector of data that has a length of 55 elements (55 heel strikes). I want to create a matrix where each column is hip angle data between successive elements of the heel strike vector (each column represents one stride). I have tried for loops and while loops, but nothing has worked.
I was able to create a single column of data representing one stride (using the commands below), but I need to get all 54 strides into a matrix. Do any of you have suggestions to how I can create the matrix?
i = 1;
LHIP(:,1) = LHIP_Angles(LHEE_Strikes(i):LHEE_Strikes(i+1));
Thanks in advance.

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Geoff Hayes
Geoff Hayes 2015-11-3

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John - since it is unlikely that each stride has the same number of hip angles, you may want to use a cell array to store the data. Try the following
LHIP = cell(1,length(LHEE_Strikes)-1);
for k=1:length(LHEE_Strikes)-1
LHIP{k} = LHIP_Angles(LHEE_Strikes(k):LHEE_Strikes(k+1));
end

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John Harry
John Harry 2015-11-3
Hi, Geoff.
Your suggestion worked great and I can now double click on the specific element in the cell array to display the hip angles for each stride.
Is there a way to convert the cell array to a data array so that I can call the data in a for loop? The task now is to time normalize each column of data to 101 data points and have them stored into one matrix.
Thanks again for your help!
John Harry
John Harry 2015-11-3
I wanted to let you know that I figured out how to normalize the cell array (created with your code, Geoff) and normalized it to 101 data points and then converted to a matrix.
Thanks again.
Geoff Hayes
Geoff Hayes 2015-11-3
Awesome - glad to have been able to help, John!

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