Match function in matlab

Question

Mateusz Brzezinski 2020-2-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/506636-match-function-in-matlab

回答： Melissa Rosa 2023-3-1

采纳的回答： Mateusz Brzezinski

在 MATLAB Online 中打开

Hello,

I am looking for a function that corresponds to the excel "match" function.

I have an array of (n,32) where n is sated in for loop function as a number of completed loops (so it differs).

DataOutput = zeros(length(phiAStart:phiAStep:phiAEnd),32);

I would like to find the smallest value in column 32 (y) and get the corresponding value in column 1 (x) where y=f(x).

DataOutput(colector,1) = x;   
DataOutput(colector,32) = y;

I can not resolve a function (to get x) having y because it's numerically calculated polynomial so I thought about something similar that MATCH function from excel.

Is there any similar function in Matlab or simple script that can be introduced?

I will be thankful for any suggestions or codes that may work.

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Answer 1

Mateusz Brzezinski 2020-2-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/506636-match-function-in-matlab#answer_416543

编辑：Mateusz Brzezinski 2020-2-20

在 MATLAB Online 中打开

number = min(DataOutput(:,32));
position = find(DataOutput(:,32)==number);
matchingx = DataOutput(position,1)

Works just fine

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Steven Lord 2020-2-20

That will give you all the matching x values. Do you want that or do you want the first such match?

Mateusz Brzezinski 2020-2-21

编辑：Mateusz Brzezinski 2020-2-21

Ok, so what I have is 3rd derivative (f''') from fuction (f)

f''' always has only one root. I just assigned absf'''=abs(f''') to (DataOutput(colector,32)) so it flips negative values of f''' and I am looking for smalest value of absf''' and code above returnes me only one abs(f''') value.

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