Warning: Rank deficient, rank

Question

Eng. Fredius Magige 2016-11-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310174-warning-rank-deficient-rank

评论： Walter Roberson 2016-11-2

I am calling some element/indexing from matrix to allocate some element in another matrix (not having the same row and column). am ending with

Warning: Rank deficient, rank = 0,  tol = 0.0000e+000. ??? Error using ==> mldivide
Matrix dimensions must agree.

Please assist on that warning, the code mentioned below

for Xx=1: JmRow            % allocation of all flowing in pipeline
  if(Graptable(Xx,14) ~=0&&Graptable(Xx,5)==0&&Xx~= JmRow)
    xycon(Graptable(Xx,2)-0,4)=Graptable(Xx,14)
elseif(Graptable(Xx,14) ~=0&&Graptable(Xx,5) ~= 0&&Xx~= JmRow)
    xycon(Graptable(Xx,2)-0,4)=Graptable(Xx,14)
    xycon(Graptable(end,2)+sum(Graptable(1:Xx-1,3))+1-0,4)=Graptable(Xx,15)
elseif(Graptable(Xx,14) ==0&&Graptable(Xx,5) ~=0&&Xx~= JmRow)
    xycon(Graptable(end,2)+sum(Graptable(1:Xx-1,3))+1-0,4)=Graptable(Xx,15)
else
xycon(Graptable(end,2)-0,4)=sum(Graptable(Xx,14:15))
end
end

2 个评论
显示无隐藏无

Eng. Fredius Magige 2016-11-2

Hi Walter thanks, the code is very huge more than 50 pages. when ignore this code and manually add all relevant input in xycon matrix, i got correct answer without any warning, thus why i suspect this code

Walter Roberson 2016-11-2

Well you could save() the relevant variables into a .mat and construct an example that load()'s them and then has the code that leads to the failure.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2016-11-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310174-warning-rank-deficient-rank#answer_241603

The code you posted is not able to produce the warning or the error message you indicate. The error message you post is generated by the \ operator, which your posted code does not use. (Not unless possibly Graptable is a function instead of the array it appears to be.)

Please post your complete code and a complete copy of the error message, everything in red.