I have an error using walsh. It says

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Teo
Teo 2024-11-28
评论： Image Analyst 2024-11-29
t1=-1;
t2=3;
N=2048;
t0 = (t2-t1)/N;
t = t1:t0:t2-t0;
xt = t.^3-4*t.^2+t+6;
n=4;
H=walsh(n,N); %%THERE IN AN ERROR. Error using () Too many input arguments. Expected 0 (in addition to System object), got 2.
K=t0*diag(H*H')
C=t0*H*xt'./K
xxt=C'*H;
ee=1/(t2-t1)*t0*sum((xt-xxt).^2);
ee=1/(t2-t1)*(t0*sum(xt.^2)-K'*C.^2);
close all; hold all;
plot(t,xt);
plot(t,xxt,'Color','red');
xlabel('t sek');ylabel('x(t)');

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回答（2 个）

Walter Roberson
Walter Roberson 2024-11-28
编辑：Walter Roberson 2024-11-28
walsh() is not the name of any Mathworks supplied function.
walsh() is the name of one File Exchange contribution, https://www.mathworks.com/matlabcentral/fileexchange/50202-walsh-n but that function expects only a single parameter.
My guess is that you did, https://www.mathworks.com/help/comm/ref/comm.walshcode-system-object.html
walsh = comm.WalshCode();
If so, then the resulting object is invoked as a function using
H = walsh();
with no parameters. You might previously have done,
walsh.Length = N;
walsh.Index = n;
  6 个评论
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Image Analyst
Image Analyst 2024-11-29
@Teo Humar, wow -- it's really hard to get information from you so we can help you. And I'm not sure why. Did you overlook Walter's request:
What shows up for
which -all walsh
on your system, and on your colleague's system?
otherwise, why didn't you answer it? And please answer his last question about how you created the "walsh" variable. Help us to help you.

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Image Analyst
Image Analyst 2024-11-29
I recreated your problem:
>> walsh
Execution of script walsh as a function is not supported:
C:\Users\Mark\Documents\MATLAB\work\Tests\walsh.m
Error in walsh (line 8)
H=walsh(n,N); %%THERE IN AN ERROR. Error using () Too many input arguments. Expected 0 (in addition to System object), got 2.
^^^^^^^^^^
The problem is that you named your script walsh.m. Give your m-file some different name, like testwalsh.m or something.
  2 个评论
Walter Roberson
Walter Roberson 2024-11-29
Ran in:
S = [
"t1=-1;"
"t2=3;"
"N=2048;"
"t0 = (t2-t1)/N;"
"t = t1:t0:t2-t0;"
"xt = t.^3-4*t.^2+t+6;"
"n=4;"
"H=walsh(n,N);"];
writelines(S, 'walsh.m');
walsh
Execution of script walsh as a function is not supported:
/users/mss.system.xh7fl/walsh.m

Error in walsh (line 8)
H=walsh(n,N);
That does not say anything about "Too many input arguments. Expected 0 (in addition to System object), got 2.". In order to get that message, walsh() needs to be a system object.
Image Analyst
Image Analyst 2024-11-29
You're right - I was seeing the comment instead of an actual system error. I was confused because it was also in red.

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