what is wrong with my function code

Question

Mohammed Alqanber 2015-11-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253539-what-is-wrong-with-my-function-code

编辑： Stephen23 2015-11-7

clear all;
close all;
function out = random_rayleigh (x,y)
msg=nargchk(0,2,nargin);
error(msg);
if nargin <1
    y=1;
    x=1;
elseif nargin<2
    y=x;
end
array1=randn(x,y);
array2=randn(x,y);
out=sqrt(array1.^2+array2.^2);
no_of_samples=1000000;
mean_noise_level=10;
Detection_threshold_dB=[5.,6.,7.,8.,9.,10.,11.,12.,13.];
threshold_in_v=mean_noise_level.*10.0.^(Detection_threshold_dB/20.);
tota_samples=mean_noise_level/1.25*random_rayleigh(1,no_of_samples);
for jj=1:length(threshold_in_v)
    total(jj)=sum(total_samples>threshold_in_v(jj));
end
fprintf('the constant false alarm rate for the threshold level is:');
for jj = 1:length(threshold_in_v)
    fprintf('threshold(volts)=%5.1f dB Pfa=%14.5e', Detection_threshold_dB(jj),total(jj)/no_of_samples);
end
end

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Stephen23 2015-11-7

编辑：Stephen23 2015-11-7

The Problem is called cargo-cult programming: beginners use clear all and close all, without knowing why they are doing this.

The Solution is to stop using clear all and close all at the beginning of every function, without knowing what they are actually useful for, and when they should be used.

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