MATLAB: Interpolate Two Column Vectors of different lengths.

interpolationMATLAB

Hello, I have a column vector with data but it is not the proper length. I think I need to interpolate the data so that it can be expanded to be the same length as another column vector that I have. Can someone please show me how to interpolate a column vector so that it is the same length as a second, longer column vector? Thank you.

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help interp1

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MATLAB: Interpolating Data from Vectors of Different Length

This is a job for the interp1 function:

% Make original data
oldPcntVals = [0 .1 .3 .7 .9 1];
oldYvals = [10 12 15 13 12 11]
% Set a new spacing from 0 to 1 and interpolate
newPcntVals = 0:0.02:1;
newYvals = interp1(oldPcntVals, oldYvals, newPcntVals);
% Compare the original values to these interpolated values
figure
plot(oldPcntVals, oldYvals, 'b.', newPcntVals,newYvals, 'g')

Keep in mind that the default interpolation method for interp1 is "linear". You could also set "cubic" or "spline" if you wanted to have your final output smoothly interpolate between your original data.

MATLAB: Dde23: Derivative and history vectors have different lengths.

The output of the delay differential equation is expected to have a single output that is a column vector that is the derivatives. Instead you have two outputs, the first of which is a copy of the time. But the time is a scalar, and a scalar does not match the history vector size of being a 3x1 vector.

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MATLAB: Interpolating Data from Vectors of Different Length

MATLAB: Dde23: Derivative and history vectors have different lengths.

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