Question on using interpolate function

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Deepa Maheshvare
Deepa Maheshvare 2020-1-28
评论： Deepa Maheshvare 2020-1-28
I've the following
x = [1 2 3 4 5 6];
data = [0.1 0.2 0.3 0.4 0.4 0.4];
vq1 = interp1(data,x,0.4)
I want to find the x value at which data has 0.4 (first occurence).
I used interpolate. But the following error occurS
The grid vectors must contain unique points.
Any suggestions on how to proceed when data doesn't contain uniqe values will be helpful
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Deepa Maheshvare
Deepa Maheshvare 2020-1-28
I'm still expecting answers for this post. Unfortunately, the following suggestions didn't help.

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回答（2 个）

KSSV
KSSV 2020-1-28
Use logical indexing:
x = [1 2 3 4 5 6];
data = [0.1 0.2 0.3 0.4 0.4 0.4];
vq1 = x(abs(data-0.4)<10^-5)
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Deepa Maheshvare
Deepa Maheshvare 2020-1-28
编辑：Deepa Maheshvare 2020-1-28
I'm looking for an interpolation function. It may happen that Ive to check for a value of 0.45 that is not present in data

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Bhaskar R
Bhaskar R 2020-1-28
"I want to find the x value at which data has 0.4 (first occurence)."
match_loc = find(data == 0.4);
val = x(x == match_loc(1)); % first occurance of 0.4

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