can anybody please tell me the use of 'val' function in this program.., it is not a valid function,yet the program can't be executed without using this,or by changing the function name.

Question

Sreya 2013-3-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67809-can-anybody-please-tell-me-the-use-of-val-function-in-this-program-it-is-not-a-valid-function

% Load original 1D signal.
clc;
clear all;
close all;
ELEVATED=[]
[fname path]=uigetfile('*.mat');
fname=strcat(path,fname);
          load(fname );
         z=zeros(100,1);
         A=val(1,:)
         v1=val(1,:)-val(1,1)
         A=v1
         A=A'
         zc=A(1)
         A=[z;A;z]
        %  s = A(1:1:400);
          s = A;
          ls = length(s);
          figure(1)
          plot(s);
          title('Actual Signal'),grid on
    [c,l]=wavedec(s,4,'db4');
    ca1=appcoef(c,l,'db4',1);
    ca2=appcoef(c,l,'db4',2);
    ca3=appcoef(c,l,'db4',3);
    ca4=appcoef(c,l,'db4',4);
    figure(2)
    plot(c),title('decomposed signal'),grid on
    figure(3)
    subplot(2,2,1)
    plot(ca1),title('1st level reconstructed'),grid on
      subplot(2,2,2)
    plot(ca2),title('2nd level reconstructed'),grid on
      subplot(2,2,3)
    plot(ca3),title('3rd level reconstructed'),grid on
      subplot(2,2,4)
    plot(ca4),title('4th level reconstructed'),grid on

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Answer 1

Kye Taylor 2013-3-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67809-can-anybody-please-tell-me-the-use-of-val-function-in-this-program-it-is-not-a-valid-function#answer_79236

编辑：Kye Taylor 2013-3-19

在 MATLAB Online 中打开

The lines

 [fname path]=uigetfile('*.mat');
 fname=strcat(path,fname);
 load(fname );

will load a .mat file into the scope of MATLAB environment. That .mat file must contain a variable whose name is val. You likely do not have the .mat file in the right place on your machine, if at all.