Why this error is occured?

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Shaila parvin
Shaila parvin on 23 Jan 2014
Commented: mandakini behera on 17 Jan 2019
>> a=imread('test.png');
>> imshow(a)
??? Attempt to call constructor image with incorrect letter case.
Error in ==> basicImageDisplay at 9 hh = image(xdata,ydata,cdata, ...
Error in ==> imshow at 246 hh = basicImageDisplay(fig_handle,ax_handle,...
>>
  1 Comment
mandakini behera
mandakini behera on 17 Jan 2019
%this file remove noise from signal using filter
%%simulate noisy signal
Fs = 500;
f = 20;
n = [1/Fs:1/Fs:1];
x = sin(2*pi*f*n);
%add noise to the signal
y = x + rand(1,length(x));
%plot the noisy signal
subplot(3,4,1);plot(n,y);
title('noisy signal');
xlabel('time(s)');
ylabel('amplitude');
%spectral analysis of the signal
L = length(y);
NFFT = 2^nextpow2(L);
y_fft = abs(fft(y,NFFT));
%creating frequency axis
freq = Fs/2*linspace(0,1,NFFT/2+1);
%plot sigle sided amplitude spectrum
subplot(3,4,2);
plot(freq,y_fft(1:NFFT/2+1));
title('single-sided amplitude spectum of y(t)');
xlabel('frequency(Hz)');
ylabel('|y(f)|');
%%design filter and apply on the sequence.
o = 5;
wn = [3 7]*2/Fs;
[b,a] = butter(o,wn,'bandpass');
%see frequency response of the filter
[h,w] = freqz(b,a,1024,Fs);
subplot(3,4,3);
plot(w,20*log10(abs(h)));
title('magnitude response of the filter');
xlabel('frequency(Hz)');
ylabel('magnitude');grid on;
%filter the signal
y_filt = filter(b,a,y);
subplot(3,4,4);
plot(n,y_filt);
title('filtered signal');
xlabel('time(s)');
ylabel('amplitude');
By Executing this programe the error occurs like the following.how can it will be error free and give output ,kindly suggest me.
removenoise
Error using subplot (line 109)
Attempt to call constructor handle with incorrect letter case.
Error in removenoise (line 10)
subplot(3,4,1);plot(n,y);

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Accepted Answer

Walter Roberson
Walter Roberson on 23 Jan 2014
Somewhere in your MATLAB path, you have your own routine that has the same name as one of the internal MATLAB graphic routines.
  6 Comments
Tesfatsiyon Mehale
Tesfatsiyon Mehale on 3 Dec 2018
Yap it's Good answer . I did it

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More Answers (1)

Tesfatsiyon Mehale
Tesfatsiyon Mehale on 3 Dec 2018
In current folder path on Matlab that mean your default matlab file save path and check the file name image.m and remove it . after that it will be working .

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