Adding Rows to a Matrix

Started by camdmag April 14, 2005


Hi

Could somebody please help.

Inside a loop I generate a (1X5)vector. At each step I want to
include this vector as a new row of a matrix. So, for example, after
10 times through the loop I will have generated a (10X5) matrix.

Is there a quick way of doing this?

Any help would be much appreciated.

Thanks

Cal




hi cal,
if 'b' is the 1X5 vector generated inside the for loop, and 'a' is the
10X5 matrix that you need,

for i=1:10
%some processing to obtain b
a(i,:)=b;
%or a=[a;b];
end

regards,
Ravi

>
> Hi
>
> Could somebody please help.
>
> Inside a loop I generate a (1X5)vector. At each step I want to
> include this vector as a new row of a matrix. So, for example, after
> 10 times through the loop I will have generated a (10X5) matrix.
>
> Is there a quick way of doing this?
>
> Any help would be much appreciated.
>
> Thanks
>
> Cal >


--
V Ravi Chander,
Emerging Technologies and Services Group,
Reliance Infocomm Ltd.



Hi,

two solutions :

A=[];
for n=1:10
A=[A rand(1,5)];
end

or

A=zeros(10,5);
for n=1:10
A(n,:)=rand(1,5);
end

The second one should be faster because matrix A is pre-alocated.

Je



Hi,

two solutions :

A=[];
for n=1:10
A=[A rand(1,5)];
end

or

A=zeros(10,5);
for n=1:10
A(n,:)=rand(1,5);
end

The second one should be faster because matrix A is pre-alocated.

Je



hi cal,
if 'b' is the 1X5 vector generated inside the for loop, and 'a' is the
10X5 matrix that you need,

for i=1:10
%some processing to obtain b
a(i,:)=b;
%or a=[a;b];
end

regards,
Ravi

>
> Hi
>
> Could somebody please help.
>
> Inside a loop I generate a (1X5)vector. At each step I want to
> include this vector as a new row of a matrix. So, for example, after
> 10 times through the loop I will have generated a (10X5) matrix.
>
> Is there a quick way of doing this?
>
> Any help would be much appreciated.
>
> Thanks
>
> Cal >


--
V Ravi Chander,
Emerging Technologies and Services Group,
Reliance Infocomm Ltd.




Hi

Could somebody please help.

Inside a loop I generate a (1X5)vector. At each step I want to
include this vector as a new row of a matrix. So, for example, after
10 times through the loop I will have generated a (10X5) matrix.

Is there a quick way of doing this?

Any help would be much appreciated.

Thanks

Cal