Matlab:如何在两个方向上用A的其他值替换矩阵A的某些元素? [英] Matlab: How to replace certain elements of a matrix A by other values of A in both directions?

问题描述

对于包含1至100之间的数字的矩阵A(10x100000)，如何在两个方向上将A的某些元素与A的其他值互换?

示例:

用[47 78 41 1 99 98]替换[5 7 9 18 55 4]和用[5 7 9 18 55 4]替换[47 78 41 1 99 98]的数字

解决方案

使用 ismember :

n1 = [1 2 3]; %// first set of numbers
n2 = [4 5 6]; %// second set of numbers
[v1, i1] = ismember(A,n1);
[v2, i2] = ismember(A,n2);
A(v1) = n2(i1(v1));
A(v2) = n1(i2(v2));

示例:

>> A = randi(8,4,5)
A =
     2     2     8     4     6
     2     5     3     8     2
     5     4     3     2     5
     4     3     2     3     4

被转化为

A =
     5     5     8     1     3
     5     2     6     8     5
     2     1     6     5     2
     1     6     5     6     1

for a matrix A (10x100000) containing numbers between 1 and 100, how to interchange some elements of A by other values ​​of A in both directions?

example:

replace numbers [5 7 9 18 55 4] by [47 78 41 1 99 98] and [47 78 41 1 99 98] by [5 7 9 18 55 4]

解决方案

Use the two outputs of ismember:

n1 = [1 2 3]; %// first set of numbers
n2 = [4 5 6]; %// second set of numbers
[v1, i1] = ismember(A,n1);
[v2, i2] = ismember(A,n2);
A(v1) = n2(i1(v1));
A(v2) = n1(i2(v2));

Example:

>> A = randi(8,4,5)
A =
     2     2     8     4     6
     2     5     3     8     2
     5     4     3     2     5
     4     3     2     3     4

is transformed into

A =
     5     5     8     1     3
     5     2     6     8     5
     2     1     6     5     2
     1     6     5     6     1

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