Matlab逆运算和警告

问题描述

不太清楚这意味着什么.警告:矩阵对于工作精度至关重要."

Not quite sure what this means."Warning: Matrix is singular to working precision."

我有一个3x4矩阵，称为矩阵bestM矩阵Q是bestM的3x3，矩阵m是bestM的最后一列

I have a 3x4 matrix called matrix bestMmatrix Q is 3x3 of bestM and matrix m is the last column of bestM

我想做C =-Q *矩阵m的逆矩阵我得到那个警告和C = [Inf Inf Inf]这是不对的，因为我正在计算世界上的相机中心

I would like to do C = -Inverse matrix of Q * matrix mand I get that warningand C =[Inf Inf Inf] which isn't right because i am calculating for the camera center in the world

bestM = [-0.0031 -0.0002 0.0005 0.9788;
         -0.0003 -0.0006 0.0028 0.2047;
         -0.0000 -0.0000 0.0000 0.0013];

Q = bestM(1:3,1:3);
m = bestM(:,4);

X = inv(Q);
C = -X*m;
disp(C);

推荐答案

一个奇异矩阵可以被认为是等效于零的矩阵，当您尝试将0求反时，它会爆炸(变为无穷大)，这就是您的本意.到这里.用户1281385对于使用format命令提高精度绝对是错误的； format命令用于更改显示给您的内容的格式.实际上，格式的帮助命令的第一行说

A singular matrix can be thought of as the matrix equivalent of zero, when you try to invert 0 it blows up (goes to infinity) which is what you are getting here. user 1281385 is absolutely wrong about using the format command to increase precision; the format command is used to change the format of what is shown to you. In fact the very first line of the help command for format says

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