error from Interpolation of the attached data

could you please help me debug Matlab code for interpolation of the attached data?

Thanks,

load('data.mat');
figure(1);plot(x1,y1);

figure(2);plot(x2,y2);

assert(numel(unique(x1))==numel(x1),'Replicated point(s) in x1')
%assert(numel(unique(x2))==numel(x2),'Replicated point(s) in x2')

As the error message you got says, there is a duplicated value in the x2 vector -- not allowed in interp1

ix=find(diff(x2)==0)        % find who are the culprits

ix = 56

format longe
x2(ix:ix+1)

ans = 2×1

1.052958067000000e+03 1.052958067000000e+03

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[x2,ia]=unique(x2);
y2=y2(ia);
x= linspace(700,1400,701).';
y11 = interp1(x1,y1,x);
y22 = interp1(x2,y2,x);



figure(3);plot(x,y11);

figure(4);plot(x,y22);

Answer 1

[Torsten]

clear all
load('data.mat');

[x1,i1] = unique(x1);
y1 = y1(i1);
[x2,i2] = unique(x2);
y2 = y2(i2);

figure(1);plot(x1,y1);

figure(2);plot(x2,y2);

x= linspace(700,1400,701).';
y11 = interp1(x1,y1,x);
y22 = interp1(x2,y2,x);

figure(3);plot(x,y11);

figure(4);plot(x,y22);

Answer 2

[Jan]

This seems to be a job for https://www.mathworks.com/matlabcentral/fileexchange/16098-uniquify .

Then:

load('data.mat');
figure;
plot(uniquify(x1), y1)