Getting an error of "Not enough input arguments."

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Sumukh Desu
Sumukh Desu 2015-6-5
评论： Walter Roberson 2015-6-8
I'm defining a function which returns a vector used for design of fir filters using hamming window. I am not able to see where I'm going wrong and would appreciate if someone could help me out
Function:
function a = firfilt2(wp,ws)
n=ceil(8/(ws-wp));
if(rem(n,2)==0)
n=n+1;
end
y=hamming_alg(n);
a=fir1(n-1,wp,y);
end
function hm_wind = hamming_alg(n)
hm_wind=zeros(1,n);
for i=1:n
hm_wind(i) = 0.54 - 0.46*cos((2*pi*i)/(n-1));
end
end
Testcase:
rp=0.25;
rs=50;
wp=0.3;
ws=0.45;
filt=firfilt2(wp,ws);
freqz(filt,1);
Error Message :
>>firfilt2
Error using firfilt2 (line 2)
Not enough input arguments.
I've also tried another program which does the same thing and also determines the window automatically by using Stop Band Gain. That seemed to show the same error message. I've tried most of the tips online and also tried to debug the code line by line.

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回答（2 个）

dpb
dpb 2015-6-5
Your sample line invokes your function firfilt2 with no arguments. Not sure why you did that...otherwise, looks like the sample test should run from the command line.
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Sumukh Desu
Sumukh Desu 2015-6-8
I'm really sorry. Like you mentioned it's line 2 which is giving the error. In the original code there was a space which meant there was nothing written at line 2. I will try the suggestions and debug the code. Thanks a lot.
Walter Roberson
Walter Roberson 2015-6-8
Line 2 was the first line on which you attempted to use one of the input arguments that you did not supply when you invoked the code.

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Jan
Jan 2015-6-6
编辑：Jan 2015-6-6
Use
dbstop if error
to find out, which line causes the troubles. Which line is "line 3"?
Be sure, that the file has been saved before calling and do not use the RUN-menu in the editor, because it does not define the inputs.
  1 个评论
Sumukh Desu
Sumukh Desu 2015-6-8
I'm really sorry. Like you mentioned it's line 2 which is giving the error. In the original code there was a space which meant there was nothing written at line 2. I will try the suggestions and debug the code and get back to you. Thanks a lot.

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