MATLAB: How to write equation in matlab ?

anonymous functionfringeimage processingImage Processing Toolboxsignal processing

equations and corresponding graph is given in attached file and i am trying like this but unable to find second graph where is wrong,, please help

%reflection function
s = @(x) (1-0.4*(cos(x/100))).*(0<=x & x<=511);
x = linspace(0, 500);
R = s(x);
figure(1)
plot(x,R)
axis([xlim 0 1.5]) 
% intensity function
f=1/20;
x = linspace(0, 500);
I=@(x) (R(x).*sin(2*pi*f*x));
plot(x,I)
axis([xlim 0 1.5])

Best Answer

I=@(x) s(x).*sin(2*pi*f*x); 
plot(x,I(x))

Best wishes

Torsten.

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MATLAB: Why am i getting error in making trapezoidal wave form

When posting a question including codes, use the proper code format to properly shape your question.

At multiple instances you defined equations similar to:

imn(6*x/T)

while it should be:

imn*(6*x/T)

There was a whole bunch of other typos too. Also, you did not accurately define the limits of 'x' for pretty much all the segments of the waves. Some times if you pay attenuation to the details of the errors MATLAB provides, you can debug your code a lot faster than asking on MATLABAnswers! Any who, here is the correct version of the code you are looking for. Hope it helps!

   %%FIRST TRAPEZOIDAL WAVE FORM 
   clc; clear all; 
   imx=8; 
   imn=2; 
   T = 20; 
   s1= @(x) (imx+imn).*((0<=x & x<T/6) | (x>=5*T/6 & x<=T)) ...
       +(imx+imn*(2-6*x/T)).*(T/6<=x & x<T/3)...
       +(imx).*(T/3<=x & x<2*T/3)...
       +(imx+imn*(6*x/T-4)).*(2*T/3<=x & x<5*T/6);
   x = linspace(0, 20,500); 
   I1 = s1(x); 
   figure(1) 
   plot(x,I1) 
   ylim([.9*imx 1.1*(imx+imn)])
   %%SECOND TRAPEZOIDAL WAVE FORM 
   clc; clear all; 
   imx=8; 
   imn=2; 
   T = 20; 
   s2= @(x) (imx+imn*(6*x/T)).*(0<=x & x<T/6) ...
       +(imx+imn).*(T/6<=x & x<T/2)...
       +(imx+imn*(4-6*x/T)).*(T/2<=x & x<2*T/3)...
       +(imx).*(2*T/3<=x & x<=T); 
   x = linspace(0,20,500); 
   I2 = s2(x); 
   figure(2) 
   plot(x,I2) 
   ylim([.9*imx 1.1*(imx+imn)])

THIRD TRAPEZOIDAL WAVE FORM

   clc; 
   clear all; 
   imx=8; 
   imn=2; 
   T = 20; 
   s3= @(x) (imx).*(0<=x & x<T/3) ...
       +(imx+imn*(6*x/T-2)).*(T/3<=x & x<T/2)...
       +(imx+imn).*(T/2<=x & x<5*T/6)...
       +(imx+imn*(6-6*x/T)).*(5*T/6<=x & x<=T); 
   x = linspace(0,20,500); 
   I3 = s3(x); 
   figure(3) 
   plot(x,I3)
   ylim([.9*imx 1.1*(imx+imn)])

MATLAB: How to find color pattern

Your values are negative so they show up as black because imshow() expects floating point color images to be the in the range 0-1 and anything below 0 is black and anything above 1 is white. Here's a workaround to scale your data using mat2gray():

realColor = mat2gray(real(Color));
imagColor = mat2gray(imag(Color));
figure(2)
imshow(realColor);
figure(3)
imshow(imagColor);
title('vertical fringes'),impixelinfo;

Best Answer

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MATLAB: Why am i getting error in making trapezoidal wave form

MATLAB: How to find color pattern

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