How to work with interpolation function?

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R7 DR 2015-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/179321-how-to-work-with-interpolation-function

评论： R7 DR 2015-2-20

I am trying to do the interpolation between given set of data. I used interp1 function but it is showing the error as ''The grid vectors are not strictly monotonic increasing''

A=
21
22
11
73
03
299
92
5
63
93
35
91
71
42
02
05
354
45
48
58
28
41
B=
10855
11775
12746
13738
14831
16082
17539
32785
35750
38682
41663
44895
48715
52816
69683
70275
70755
71234
71765
72197
72559
75153
I write the code like this..
x=0.2:0.1:0.5
    D=interp1(B,A,x)

How to solve this problem??

Thanks

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Star Strider 2015-2-19

The code you posted works. What do you want to do with your data and the interpolation? You have to tell us what the problem is.

R7 DR 2015-2-20

在 MATLAB Online 中打开

interpolation.xlsx

I wrote the code like this, but showing the same error. I am attaching the excel file. could you please check once.

A=xlsread('interpolation.xlsx','sheet1','A:A')
B=xlsread('interpolation.xlsx','sheet1','B:B')
x=0.2:0.1:0.5
    D=interp1(B,A,x)

Thanks

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采纳的回答

Titus Edelhofer 2015-2-20

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Hi,

in your file B67 is equal to B68. Remove one of the lines.

Titus

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Titus Edelhofer 2015-2-20

No, since the data on x are not monotonic. Now it depends on the application, you can e.g. sort the data (using sort or sortrows), if this makes sense.

R7 DR 2015-2-20