Help with code needed - sampling

Question

Tom 2012-1-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/27092-help-with-code-needed-sampling

I have an equation of a signal, and I'm supposed to be making a PDF graph of it - but I can't use any of Matlab's inbuilt functions.

I'm only half way through the code - I need a 2-D matrix and I can't get it working.

close all
clear all
freq = 220; 
ar = 2; 
M = 10; 
n = linspace(0,M-1,M); 
An = 3+n*ar/M; 
N = 10; 
T = 1; 
j = linspace(0,N-1,N); 
tj = j*T/N; 
xj = 4-cos(2*pi.*tj); 
fnj = zeros(M,N); 
for g = 1:length(An)
    for h = 1:length(xj)
          if An <= xj <= (An+1)
              fnj(g,h) = 1;
          else
              fnj(g,h) = 0;
          end
      end
  end

What I want if for the matrix 'fnj' to be made up of 0s and 1s - so for each amplitude point, a number of samples can be totalled - giving a spread of data which can then be plotted to give a PDF.