Building a set of simple moving averages using a loop

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Quantopic
Quantopic 2014-10-7
回答： Geoff Hayes 2014-10-7
Hi everyvody,
I have to build a set of simple moving averages with different periods; may be that my problem is pretty tricky, but I really do not know how to solve that.
I thought to use the loop for as it follows:
for i = 5:1:30
SMAvector(:,i) = tsmovavg(vector,'s',i,2);
end
but matlab gives an error out as:
Undefined function 'le' for input arguments of type 'cell'.
Can someone help me to find a solution or explain me what does the error mean? Thanks in advance for the help.
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Geoff Hayes
Geoff Hayes 2014-10-7
Ok - what have you defined SMAvector to be? Is it a cell array or an empty matrix or..? What happens if you do
SMAvector = zeros(length(vector),30-5+1);
for k = 5:1:30
SMAvector(:,k-5+1) = tsmovavg(vector,'s',k,2);
end
Note that I replaced your i with k since both i and j are used as representations for the imaginary number, and so it is good practice to avoid using either as indices in loops.

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Geoff Hayes
Geoff Hayes 2014-10-7
Quantopic verified that the vector variable was of type double. As it was unclear how the SMAvector variables was declared, it was suggested that the following code be tried
SMAvector = zeros(length(vector),30-5+1);
for k = 5:1:30
SMAvector(:,k-5+1) = tsmovavg(vector,'s',k,2);
end
That seemed to work.

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