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Column-wise interpolation of an NxM matrix?

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D G
D G 2012-7-16
Hi!
I'm wondering if it is possible to interpolate column-wise along an NxM matrix.
Previous size were:
x = 1x200
Y = 1x200
xi = 1x200
New values are
x = 1x200
Y = 10x200
xi = 1x200
I have a loop that does it now, but would prefer to vectorize it as long as it is readable.
Thanks!
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Jan
Jan 2012-7-16
How do you "interpolate" along a singelton dimension? Could post your loop method - by editing the question, not as comment or answer?

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回答（3 个）

Sean de Wolski
Sean de Wolski 2012-7-16
Sure:
doc interp1
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D G
D G 2012-7-16
Try this:
y = magic(10);
x = (1:20)';
xi = linspace(1,10,50)';
interp1(x,y,xi, 'linear', 'extrap');
Why would this fail?
Teja Muppirala
Teja Muppirala 2012-7-17
That fails because y has 10 values, and your x has 20 values. But as Sean said, INTERP1 works perfectly fine. Just transpose your data first:
Yi = interp1(x',Y',xi','linear','extrap')';

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Doug Hull
Doug Hull 2012-7-16
Why do you want to vectorize it?
If it is working, and it is apparently readable, wouldn't your time be better spent on other aspects of the code?
Jan
Jan 2012-7-16
A faster implementation than INTERP1: FEX: ScaleTime.

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