MATLAB Central Newsreader - NEED URGENT HELP PLEASE !!!

NEED URGENT HELP PLEASE !!!

Carlo Castellucci — Wed, 18 Mar 2009 23:45:40 -0400

MatLab gives me the following warning "MISSING MATLAB OPERATOR" whenever I try to paste the following square matrix in the command window ( it is 11x11 sized )...

A=[0,1,1,1,0,10,1,0,0,0,0;-2,0,0,4,2,8,0,0,3,2,1;-1,1,2,0,0,0,0,0,0,0,0;0,0,0,0,0,0,0,0,0,1,0;0,0,0,0,0,0,0,0,0,0,1;0,0,0,0,0,0,0,2,1,0,0;...
1,0,0,0,0,0,0,0,0,0,0;0,0,0,0,0,0,1,0,0,0,0;0,0.1,0.1,-0.9,0.1,0.1,0,0.1,0.1,0.l,0.1;...
0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,-0.9999,0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5;0,0,0,0,0,0,0,0,0.8225,0,0];

I don't know what it is wrong about it and I really need this matrix to solve a square linear system with backslash...

Thanks you all...feel free to adress your answer to my mailbox assorecato@hotmail.it as well or just post it here

Re: NEED URGENT HELP PLEASE !!!

Darren Rowland — Thu, 19 Mar 2009 00:15:03 -0400

Carlo, it is a good idea to choose a more descriptive heading than 'Help needed'.

With regards to your problem I can see that at least one of the rows contains an error
0,0.1,0.1,-0.9,0.1,0.1,0,0.1,0.1,*0.l*,0.1;

Also to make things clearer you should assign the 'magic number' to a variable
c = 8.7617*10^-5;
then use c in the matrix.

I don't know if there are any other errors but hope that helps
Darren

Re: NEED URGENT HELP PLEASE !!!

Freelance Embedded Systems Engineer — Thu, 19 Mar 2009 00:32:29 -0400

Carlo Castellucci wrote:
> MatLab gives me the following warning "MISSING MATLAB OPERATOR" whenever I try to paste the following square matrix in the command window ( it is 11x11 sized )...
>
> A=[0,1,1,1,0,10,1,0,0,0,0;-2,0,0,4,2,8,0,0,3,2,1;-1,1,2,0,0,0,0,0,0,0,0;0,0,0,0,0,0,0,0,0,1,0;0,0,0,0,0,0,0,0,0,0,1;0,0,0,0,0,0,0,2,1,0,0;...
> 1,0,0,0,0,0,0,0,0,0,0;0,0,0,0,0,0,1,0,0,0,0;0,0.1,0.1,-0.9,0.1,0.1,0,0.1,0.1,0.l,0.1;...
> 0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,-0.9999,0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5;0,0,0,0,0,0,0,0,0.8225,0,0];
>
> I don't know what it is wrong about it and I really need this matrix to solve a square linear system with backslash...
>
> Thanks you all...feel free to adress your answer to my mailbox assorecato@hotmail.it as well or just post it here

Search your string for a lowercase "L" and replace it with a "ONE".
??? 0,0.1,0.1,-0.9,0.1,0.1,0,0.1,0.1,0.l,0.1; ...
|

Re: NEED URGENT HELP PLEASE !!!

John D'Errico — Thu, 19 Mar 2009 00:58:01 -0400

"Carlo Castellucci" <xxcarlo_rossixx@yahoo.it> wrote in message <gps134$6eq$1@fred.mathworks.com>...
> MatLab gives me the following warning "MISSING MATLAB OPERATOR" whenever I try to paste the following square matrix in the command window ( it is 11x11 sized )...
>
> A=[0,1,1,1,0,10,1,0,0,0,0;-2,0,0,4,2,8,0,0,3,2,1;-1,1,2,0,0,0,0,0,0,0,0;0,0,0,0,0,0,0,0,0,1,0;0,0,0,0,0,0,0,0,0,0,1;0,0,0,0,0,0,0,2,1,0,0;...
> 1,0,0,0,0,0,0,0,0,0,0;0,0,0,0,0,0,1,0,0,0,0;0,0.1,0.1,-0.9,0.1,0.1,0,0.1,0.1,0.l,0.1;...

Typo. See that next to last 1 on this line?
Not a 1.

> 0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,-0.9999,0,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5,8.7617*10^-5;0,0,0,0,0,0,0,0,0.8225,0,0];

You do know that you can write

8.7617*10^-5

as

8.7617E-5

Easier to read. easier to write.

John