# How to create a function which takes one column of data as its input and another as its output

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Gabriel il 27 Feb 2023
Commentato: David Hill il 27 Feb 2023
I have two columns of data and need to come up with a function that take as input the values from the first column of data and outputs the corresponding values in the second column. There is no equation that links the columns together they are just two lines of data. How would I go about coming up with a function that enables me to input a value from the first column and be given the corresponding value in the second?
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Dyuman Joshi il 27 Feb 2023
"... outputs the corresponding values in the second column."
You want to store the output in the second column, over-writing the values present there?
Gabriel il 27 Feb 2023
No so for example column 1 row 6 will correspond to column 2 row 6 and column 1 row 10 corresponds to column 2 row 10. I need a function that allows me to input the values in column 1 and get the value next to it in column 2 as my output. I hope that makes sense

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### Risposta accettata

David Hill il 27 Feb 2023
Just use the find function. find
rng(1)
A=randi(100,10,2)
A = 10×2
42 42 73 69 1 21 31 88 15 3 10 68 19 42 35 56 40 15 54 20
f=A(find(A(:,2)==88),1)
f = 31
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Stephen23 il 27 Feb 2023
Logical indexing is simpler than FIND:
rng(1)
A = randi(100,10,2)
A = 10×2
42 42 73 69 1 21 31 88 15 3 10 68 19 42 35 56 40 15 54 20
V = 88;
Z = A(A(:,2)==88,1)
Z = 31
David Hill il 27 Feb 2023
Yes

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