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Error using griddedInterpolant. The grid vectors must contain unique points

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Vince Clementi
Vince Clementi on 20 Jul 2017
Commented: Julien Rosele on 22 Jun 2020 at 11:17
Hi All,
Trying to plot two different datasets with a uniform x-axis I ran through a loess filter. My code for the interp/plotting worked on one dataset, but not on another. Can't seem to figure out the issue here.
The one that worked:
% Interpolation Method
% y1 = first dataset
% yn = nth dataset
% yn = interp1(x,y,std x component,'[insert optional interp method]')
% repeat for nth datasets
y1 = interp1(x87Age,y87C,t_comp87);
y2 = interp1(x41Age,y41C,t_comp41);
plot(x87Age,y87C,'o');
hold on
plot(x41Age,y41C,'o');
plot(t_comp87,y1);
plot(t_comp41,y2);
The one that didn't work
% Interpolation Method
% y1 = first dataset
% yn = nth dataset
% yn = interp1(x,y,std x component,'[insert optional interp method]')
% repeat for nth datasets
y1 = interp1(x87Age,y87C,t_comp87);
y2 = interp1(x79Age,y79C,t_comp79);
plot(x87Age,y87C,'o');
hold on
plot(x79Age,y79C,'o');
plot(t_comp87,y1);
plot(t_comp79,y2);
Any ideas???

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Accepted Answer

Ankitha Kollegal Arjun
Ankitha Kollegal Arjun on 24 Jul 2017
This error generally occurs when there are duplicate points in the input to 'interp1'.
You can remove duplicates using 'unique' function.
For Example,
[x, index] = unique(x);
yi = interp1(x, y(index), xi);
Please apply the above logic to your code and see if it resolves the issue.

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lakshman s
lakshman s on 9 May 2020
Suppose there are 2 points of Y for 1 value of x. Then how to get the value of both the data points? No point is duplicate for me.

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