Error using scatteredInterpolant Sample values must be a double array.

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Yuansen
Yuansen 2025-11-26，21:52
移动：Matt J 2025-11-27，14:25
Dear all,
I use griddata to interpolate one 2D data. The codes worked quite well half a year. But since today, it always showed an error "Error using scatteredInterpolant. Sample values must be a double array."
Can anyone do me a favor. Thanks a lot.
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Cris LaPierre
Cris LaPierre 2025-11-27，3:45
Ran in:
I can duplicate the error if I pass string values to scatteredinterpolant.
t = linspace(3/4*pi,2*pi,5)';
x = [3*cos(t); 2*cos(t); 0.7*cos(t)];
y = [3*sin(t); 2*sin(t); 0.7*sin(t)];
v = repelem([-0.5; 1.5; 2],length(t));
F = scatteredInterpolant(num2str(x),y,v);
Error using scatteredInterpolant
The input points must be a double array.
Try adding a str2double command to the values returned by your DAQ.
Walter Roberson
Walter Roberson 2025-11-27，6:05
I would use class() on Xf0, Yf0 and Z0 to check that they are in fact class double.

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Yuansen
Yuansen 2025-11-27，9:47
移动：Matt J 2025-11-27，14:25
thank you guys! You are all right, the DAQ in this time produced "single" type data. After I define them in "double", the problem was solved.

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