Compare two data in a column of matrix

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Kim Lopez
Kim Lopez 2017-10-27
回答： BhaTTa 2024-10-23，6:36
Suppose i have a table with the following data below. Column C should be compared to column A. In the table, since -150 in column C is less than 0 in column A, then column D would copy the value of column B which is 2. The same with -50, since it is less than 0, then column D will have a value of 2. How can i implement this? Any help is appreciated.
A B C D
0 2 -150
100 3 -50
150 5 0
200 6 50
250 8 100
300 11 300
The result would something look like this
A B C D
0 2 -150 2
100 3 -50 2
150 5 0 2
200 6 50 3
250 8 100 3
300 11 300 11

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回答（1 个）

BhaTTa
BhaTTa 2024-10-23，6:36
Ran in:
Hey @Kim Lopez, you can use logical indexing to compare the values and assign them, below i have provided the code implementing the same:
% Sample data
A = [0; 10; 20];
B = [2; 4; 6];
C = [-150; -50; 25];
% Initialize D with NaN or some other placeholder
D = NaN(size(C));
% Apply the logic: if C is less than A, then D gets the value of B
D(C < A) = B(C < A);
% Display the results
result = table(A, B, C, D)
result = 3x4 table
A B C D __ _ ____ ___ 0 2 -150 2 10 4 -50 4 20 6 25 NaN
Hope it helps.

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