Using interp1 on a function that is not monotonic increasing
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I need to use the interp1 function on my two data sets, labeled x and y.
I wrote the following code:
yDesired = interp1(x,y, 0.009);
But, I receive the following error:
Error using griddedInterpolant
The grid vectors are not strictly monotonic increasing.
Error in interp1 (line 183)
F = griddedInterpolant(X,V,method);
Is there any way around this?
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回答 (2 件)
Stephen23
2015 年 9 月 7 日
編集済み: Stephen23
2015 年 9 月 7 日
John D'Errico explains here why interpolation requires a monotonic independent variable:
It seems lots of beginners misunderstand interpolation, but the answer is always the same "the independent variable must be monotonic":
If you have scattered data, then you need to use the appropriate tool, one of these might help you:
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Steven Lord
2015 年 9 月 7 日
The X input to INTERP1 must be monotonic increasing. The Y input does not need to be monotonic increasing. Call SORT with two outputs and X as input; the first output is the reordered X vector and the second output will let you reorder Y to match the reordered X.
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