| Author |
Message |
leyla
Guest
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 Posted:
Fri Dec 09, 2005 5:16 pm Post subject:
convolution |
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Hi all.
please help me with this code,I dont know what is my mistake
function[y]=myconv(x,h)
y=zeros(length(h),length(x))
for j=1:length(h)
for i=1:length(x)
if(j>=i)
y(i,j)=x(i)*h(j);
end
end
yn=zeros(1,length(x)+length(h)-1) |
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Jerry Avins
Guest
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| Posted:
Sat Dec 10, 2005 12:09 am Post subject:
Re: convolution |
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leyla wrote:
| Quote: | Hi all.
please help me with this code,I dont know what is my mistake
function[y]=myconv(x,h)
y=zeros(length(h),length(x))
for j=1:length(h)
for i=1:length(x)
if(j>=i)
y(i,j)=x(i)*h(j);
end
end
yn=zeros(1,length(x)+length(h)-1)
|
You can expect better help by stating what the code is intended to do,
and why you think it fails.
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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leyla
Guest
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| Posted:
Sat Dec 10, 2005 1:16 am Post subject:
Reply to Jerry Avins |
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hi
I intend to write a code in Matlab which convolutes the sequences x[n] an
h[n],i have run this code in Matlab but some errors are there.do i have t
use "else" statement after using "if" ?? |
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Jerry Avins
Guest
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| Posted:
Sat Dec 10, 2005 1:16 am Post subject:
Re: Reply to Jerry Avins |
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leyla wrote:
| Quote: | hi
I intend to write a code in Matlab which convolutes the sequences x[n] and
h[n],i have run this code in Matlab but some errors are there.do i have to
use "else" statement after using "if" ??
|
I don't "do" Matlab, but in every language I know, /something/ must
terminate the IF clause.
An effective way to troubleshoot hardware or code is to "poke it and see
how it wiggles." If you suspect that ELSE might be needed, why not try
it and see?
Jerry
P.S. The proper word, at least in English, is "convolve". Whether one
believes in divine creation or not, species don't evolute.
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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Guest
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| Posted:
Sat Dec 10, 2005 1:16 am Post subject:
Re: Reply to Jerry Avins |
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Some tips for you....
x[n] and h[n] are 1 dmensional sequences...The output should be
too...You have a 2-D output matrix y(i,j) .
Convolution steps: (flip a sequence, multiply, add)..
Check the formula for convolution...it'd be much simpler than your
version.
Good luck..
leyla wrote:
| Quote: | hi
I intend to write a code in Matlab which convolutes the sequences x[n] and
h[n],i have run this code in Matlab but some errors are there.do i have to
use "else" statement after using "if" ?? |
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Tim Wescott
Guest
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| Posted:
Sat Dec 10, 2005 1:16 am Post subject:
Re: Reply to Jerry Avins |
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Jerry Avins wrote:
| Quote: | Jerry
P.S. The proper word, at least in English, is "convolve". Whether one
believes in divine creation or not, species don't evolute.
|
Well, hopefully not in public, at least.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com |
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And Blah Blah Blah
Guest
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| Posted:
Sat Dec 10, 2005 1:16 am Post subject:
Re: Reply to Jerry Avins |
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leyla wrote:
| Quote: | hi
I intend to write a code in Matlab which convolutes the sequences x[n] and
h[n],i have run this code in Matlab but some errors are there.do i have to
use "else" statement after using "if" ??
|
In matlab if you get errors, a good place to start troble shooting is to
look at the errors. In the code you posted -
function[y]=myconv(x,h)
y=zeros(length(h),length(x))
for j=1:length(h)
for i=1:length(x)
if(j>=i)
y(i,j)=x(i)*h(j);
end
end
yn=zeros(1,length(x)+length(h)-1)
I would expect it to complain straight away about a missing "end".
You've not terminated the big for loop "for j=1:length(h)". |
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Guest
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| Posted:
Sat Dec 10, 2005 1:21 pm Post subject:
Re: Reply to Jerry Avins |
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leyla <leyla2698@yahoo.com> wrote:
| Quote: |
hi
I intend to write a code in Matlab which convolutes the sequences x[n] and
h[n],i have run this code in Matlab but some errors are there.do i have to
use "else" statement after using "if" ??
|
y=filter(h,1,x); |
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Rick Lyons
Guest
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| Posted:
Sun Dec 11, 2005 1:16 am Post subject:
Re: convolution |
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On Fri, 09 Dec 2005 13:09:17 -0500, Jerry Avins <jya@ieee.org> wrote:
| Quote: | leyla wrote:
Hi all.
please help me with this code,I dont know what is my mistake
function[y]=myconv(x,h)
y=zeros(length(h),length(x))
for j=1:length(h)
for i=1:length(x)
if(j>=i)
y(i,j)=x(i)*h(j);
end
end
yn=zeros(1,length(x)+length(h)-1)
You can expect better help by stating what the code is intended to do,
and why you think it fails.
Jerry
|
Hi,
also the myconv() command looks like
a user-written command. Therefore it may
be doing something unusual.
[-Rick-] |
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