using functions

Question

john 2011-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2945-using-functions

Hello,

I am a beginner in using matlab and I would like some help.I have a main program and two other functions used in this program. I use matlab 2008. I would like to ask what I must type and where (command window?) to take my results? Also, where must I write all these functions (like a m-file?)? I give you the structure of my code.

function []=Program_1();
clc;echo off;close all;
A=[ 30,31,12, 9,
  17,12,25,10,
  12, 8,17, 9,
  31,12,26,22];
A=double(A);B=A;
disp('original image matrix');disp(A);
 image_depth=31;tones=8;
 B=My_plot(A,tones);% B holds grey-tone values only
 value=1;
 switch value
  case 1
    WW=20;WL=20;
    B=My_simple_window(A,image_depth,tones,WW,WL);
  case 2
    gray_val=5;im_val=21;
      B=My_broken_window(A,image_depth,tones,gray_val,im_val);%Have to construct it
    
  case 3
    ww1=10;ww2=10;wl1=10;wl2=25;
    B=My_double_window(A,image_depth,tones,ww1,ww2,wl1,wl2);%Have to construct it
end
disp(round(B));
%======================================================
function [C]=My_plot(A,tones);
x=size(A,1);y=size(A,2);
for i=1:x 
  for j=1:y 
    ival=A(i,j);
      tone_ival=(tones-1)*(double(ival)-0)/(31-0);
    C(i,j)=tone_ival;
  end; 
end; 
disp(round(C));
%========================================================
function [C]=My_simple_window(A,image_depth,tones,WW,WL);
% WL=window level
% WW=window level
x=size(A,1);y=size(A,2);
We=(2.0*WL+WW)/2.0;
if(We>image_depth) We=image_depth;end;
Ws=We-WW; 
if(Ws<0) Ws=0;end;
for i=1:x, 
  for j=1:y, 
    ival=A(i,j);
    if (ival<=Ws) tone_ival=0; end;
    if (ival>=We) tone_ival=tones-1;end;
    
    if ( ival>=Ws & ival<=We)  
      tone_ival=(tones-1)*(double(ival)-Ws)/(We-Ws);
    end;      
    C(i,j)=tone_ival;
  end; 
end;