Question

Matlab
could someone help me write the code

%want to store the particular solution in xp.
initialize xp set it to be the zero column vector with decent dimension
using the pivot columns from A generate pA
solve for pA*temp=b where temp is a temporary vector using pA\b
put temp in the positions of xp
output xp

Answer 1

function csolve(A,b)
[x,z]=size(A);
pivot=[];
free=[1:1:z];
rreform = rref(A);
for i=1:1:x
for j=1:1:z
if (rreform(i,j)==1)
pivot=[pivot,j];
break;
end
end
end
free(pivot)='';
rank = length(pivot);
fprintf('the rank of the coefficent matrix is %d.\n',rank);
fprintf('the pivot variables are');
for i=1:1:length(pivot)
fprintf('x%d',pivot(i));
end
fprintf('.\n');
fprintf('the free variables are');
for j=1:1:length(free)
fprintf('x%d',free(j));
end
fprintf('.\n');
end

Answer 2

this is my current code runs and works fine

Answer 3

*runs*

Answer 4

? @UsukiDoll

Answer 5

I'm not too good at matlab...I'm just happy that I passed Deterministic Modeling a.k.a Mathematical Biology and I don't have to do matlab.

Answer 6

oh ok:/ @UsukiDoll

Answer 7

sorrrrrrrrry D:

Answer 8

its ok! @UsukiDoll im sure someone will help lol

Answer 9

usually it's @dan815 or @Kainui who are good at matlab but they never seem to respond and all the other matlab helpers don't show up here that often :/

But I think there's a site called stackoverflow that has online help for matlab

Answer 10

oh okay ill try that thanks!

Answer 11

http://stackoverflow.com/questions/tagged/matlab

Answer 12

Hi, still need help?

Answer 13

yes please @dan815

Answer 14

and what do you have left to do?

Answer 15

if you like a nice print

you might want spaces:
` ...variables are ');`
|
here
and
some commas,
|
```
...
fprintf('x%d, ...
end
fprintf('\b\b.\n')
...
```
using `\b` to delete the last comma (backspace)

Answer 16

@lljenjenll,

the code you have posted does seems to work fine,
but it hard to see how it matches with the question,
all the variable names are different