interpolate data in cell array

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Jessica Smith
Jessica Smith 2016-7-7
评论： Jessica Smith 2016-7-7
I have 2 cell arrays both 5x1 cell. The first cell array contains A=40x1 double and the second B=40x11. Data in A{1,1} is related to B{1,1}. What I would like to do is use the function interp1 on each array of A and interpolate the corresponding data in B in the same manner. I have used the following code with no error before the data was contained in an array (I should say I need to repeat the interpolate on each of 11 columns of cell array B):
angle = (0:3:360)';
a = data(:,1);
b(:,1)=[];
b = interp1(a,b,angle);
My initial thought is to somehow use a for loop to go through each array and repeat the function, however I am unsure how to use the function on data presented this way.
Thanks, Jess

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Guillaume
Guillaume 2016-7-7
Possibly, this will do what you want:
%A and B: cell arrays of matrices. Must have the same size
%Matrices in corresponding cells in A and B must have the same number of rows
angle = (0:3:360)';
newb = cellfun(@(a,b) interp1(a, b(:, 2:end)), angle), A, B, 'UniformOutput', false);
I'm simply using cellfun to iterate over all the cells of A and B simultaneously. cellfun calls an anonymous function which is just a rewording of the code you've provided.
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Guillaume
Guillaume 2016-7-7
编辑：Guillaume 2016-7-7
Yes, as Walter said, the a and b are just the variable names of the arguments of the anonymous function. Just as any function, you can use whatever you want as long as you use the same names in the body of the function/anonymous function (i.e. the call to interp1 in this case).
What is important are the inputs to cellfun, which in this case are A and B (for lack of a better name). If these two are not cell arrays, then of course cellfun is going to complain.
The for loop equivalent of the cellfun expression I've written would be:
assert(iscell(A), 'Input #1 expected to be a cell array');
assert(iscell(B), 'Input #2 expected to be a cell array');
assert(size(A) == size(B), 'Inputs expected to be the same size');
newb = cell(size(A));
for celliter = 1:numel(A)
a = A{celliter};
b = B{celliter};
newb{celliter} = interp1(a, b(:, 2:end)), angle);
end
As you can see cellfun is a lot more succinct!
Jessica Smith
Jessica Smith 2016-7-7
Ah I understand, my error, apologies. I will see where I have gone wrong and yes cell fun is a lot more concise. Thank you for your inputs!

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