Specific conditions for array elements

2021 8 22
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更新时间：2021 8 22
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Hello! Let's say that i have an array 5x5 filled with numbers from 1 to 20
A=randi(20,5);
How can i compute a new array B of the same size as the A with three conditions:
1. If the element of the array A is smaller than 10, B=9^2
2. If the element of the array A is equal to 10, B=0
3. If the element of the array A is higher than 10, B=20^0.5
Thank you,
Alex

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Awais Saeed
Awais Saeed 2021-8-22
编辑：Awais Saeed 2021-8-22

1 个投票

Fairly simple
clc;clear;close
A=randi(20,5);
B = A;
% get indices
B1 = find(B == 10);
B2 = find(B > 10);
B3 = find(B < 10);
% change values at those indices
B(B1) = 0;
B(B2) = 20^0.5;
B(B3) = 9^2;

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Al Ne
Al Ne 2021-8-22
Dear Awais Saeed,
Many thanks for your clear explanation! Can you also help me with that. Now, we have the array B computed the above. Along with that, we have random array C.
C=rand(5);
Can i change the elements of the array C to zero, where the elements of the array B is equal to 81?
Awais Saeed
Awais Saeed 2021-8-22
You are welcome.
C = rand(5)
% get indices where B = 81
C1 = find(B == 81);
% change values at those indices to zero
C(C1) = 0
Al Ne
Al Ne 2021-8-22
Thank you! You greatly helped me!

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Simon Chan
Simon Chan 2021-8-22

1 个投票

You may simply combine them together as follows:
B = (A>10)*(9^2)+(A==10)*0+(A<10)*(20^0.5);

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