矩阵的边界值问题 [英] Issue in bounding values of matrix

问题描述

问题:我需要将P矩阵的每个元素限制在[-1,1]范围内.我已经使用了代码 MinMaxCheck 提供，但是此代码仅适用于向量.因此，我对其进行了修改以适用于矩阵.修改后的功能代码MinMaxCheckMatrix确实仅更改了第一列，但未检查也不限制第二列元素.我无法理解为什么整个P矩阵都没有受到影响.请帮助纠正.

Problem : I need to clamp each of the elements of P matrix in the range [-1,1]. I have used the code MinMaxCheck provided but this code works only for vectors. So, I have modified it to work for matrix. The modified function code MinMaxCheckMatrix does change only the first column but the second column elements are not checked nor clamped. I am unable to understand why the entire P matrix is not getting affected. Please help in rectifying.

 SomeVector =     [20 0
                     -20 1
                      5 0.9
                      1.1 0.2
                      10  20];

 for rows =1:5
  P(rows,:) = SomeVector;
  min_range(rows,:)=-1;
  max_range(rows,:)=1;
end
 P = MinMaxCheckMatrix(min_range, max_range, P);

**Function**
function [ A2comp ] = MinMaxCheckMatrix( minimum, maximum, A2comp )
[row col] = size(minimum);

for i=1:row
    for j=1:col
        if(maximum(i,j)<A2comp(i,j)||minimum(i,j)>A2comp(i,j))
            if(maximum(i,j)<A2comp(i,j))
                A2comp(i,j)=maximum(i,j);
            else A2comp(i,j)=minimum(i,j);
            end
        end
   end
end


This is the result that I got:

P =

    1.0000         0
   -1.0000    1.0000
    1.0000    0.9000
    1.0000    0.2000
    1.0000   20.0000

推荐答案

除非我丢失了某些东西，否则看来这是一种非常过于复杂的方法:

Unless I'm missing something, that seems like a very overcomplicated way to do this:

P(P < -1) = -1;
P(P > 1) = 1;

或更狂热的人:

function mat = clamp(mat, minval, maxval)
mat(mat < minval) = minval;
mat(mat > maxval) = maxval;

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