Finding approximate y values for corresponding x values in matlab
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Oila R
am 31 Mai 2019
Beantwortet: Santiago Alcantara
am 10 Feb. 2022
Suppose I have a graph (formed from data) that has x and y values, but it is not analytic (so not continuous). I need to find a way such that for any x value, matlab will find the closest x value on the graph and give me the corresponding y value. Any ideas?
for example:
x y
1 2
2 5
3 8
4 13
5 23
6 49
So say that is my function, and I want to find the y value that corrisponds to x = 3.1 or 5.2, etc. The data is weird so I cant to a trivial linear approximation or something like that for the whole graph.
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Fangjun Jiang
am 31 Mai 2019
interp1(x,y,3.1,'nearest')
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Aleksandr Shmidt
am 30 Aug. 2020
just ran the snip in the code, 'nearest' will aproximate to the closest value in the data instead of finding value by the trend
Fangjun Jiang
am 31 Aug. 2020
That is what the OP wanted. "find the closest x value on the graph and give me the corresponding y value".
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Santiago Alcantara
am 10 Feb. 2022
A first aproach that you can use is the function "polyxpoly"( https://es.mathworks.com/help/map/ref/polyxpoly.html).
Another aproach is:
[val_1,idx_1]=min(abs(x-y))
This is usefull when the values are not exact values. You will find the minimun difference near to cero and exactly index to play with.
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