why am i getting error in making trapezoidal wave form ?

i am trying to create trapezoidal wave form but it is not working. please help code: %% FIRST TRAPEZOIDAL WAVE FORM clc; clear all; imx=8; imn=2; T = 20; s1= @(x) (imx+imn).*(0<=x & x<=T/6) +(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); I1 = s1(x); figure(1) plot(x,I1) %% 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); I2 = s2(x); figure(1) plot(x,I2) %% % 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); I3 = s3(x); figure(1) plot(x,I3) please find attachment

Answer 1

[Reza Teimoori]

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)])

[ajeet verma]

i want to create color fringe pattern from the combination of these three wave i am trying but something being wrong. so please help my code is here %% trapezoidal color fringes (vertical) clc; clear all; f1=10; % No. of vertical fringes f2=0; % No. of horizontal fringes m=1000; n=1000; a1 = zeros(m,n) ; a2 = zeros(m,n) ; a3 = zeros(m,n) ; % trapezoidal fringe 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); 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); 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(0,20,50); X = repmat(x, 1000, 20); I1 = s1(X); I2 = s2(X); I3 = s3(X); % figure(1) % subplot(131),imshow(I1,[]) % subplot(132),imshow(I2,[]) % subplot(133),imshow(I3,[]) a1=exp(1i*I1); a2=exp(1i*I2); a3=exp(1i*I3);

subplot(222),imshow(a1,[]),impixelinfo; subplot(223),imshow(a2,[]),impixelinfo; subplot(224),imshow(a3,[]),impixelinfo;

Color=zeros(m,n,3); Color(:,:,1)=a1; Color(:,:,2)=a2; Color(:,:,3)=a3; figure(2) imshow(Color,[]),title('vertical fringes'),impixelinfo;