how to write code for 2D image using code for one dimensional plot given below?
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a = 0.1;
T = 20;
s = @(x) (2*a*x/T) .* (0<=x & x<=T/2) + (2*a*(1-x/T)) .* (T/2<=x & x<=T);
x = linspace(0, 20);
sv = s(x);
figure(1)
plot(x,sv)
hold on
for k1 = 20:20:60
plot((x+k1),sv)
end
hold off
1 Comment
I understand that your code generates a 2D plot, since you are plotting x [x-axis] verses s(x) [y-axis]. When you say ‘write code for 2D image’; are you trying to form some kind of a 2D pattern using code (given the triangular plot you have generated, it is already a 2D image)? Or are you trying to save the image programmatically? You could directly export the image from the figure window if that is what you are looking for. If you are looking to save a figure in a specific file format using code, it might help to look up the documentation on saving the current figure https://www.mathworks.com/help/matlab/ref/saveas.html .
Accepted Answer
Star Strider
on 6 Jul 2017
I am still not certain what you want.
See if this works:
a = 0.1;
T = 20;
s = @(x) (2*a*x/T) .* (0<=x & x<=T/2) + (2*a*(1-x/T)) .* (T/2<=x & x<=T);
x = linspace(0, 20);
X = repmat(x, 80, 4);
sv = s(X);
figure(1)
imagesc(0:size(X,1)-1, 1:size(X,2), sv)
set(gca, 'YTick',[])
10 Comments
ajeet verma
on 7 Jul 2017
Edited: Star Strider
on 7 Jul 2017
Star Strider
on 7 Jul 2017
It seems to me that it does. It’s necessary to change the repmat call and change to use imshow, but this seems to do what you want with the triangular waveform that you posted:
a = 0.1;
T = 20;
s = @(x) (2*a*x/T) .* (0<=x & x<=T/2) + (2*a*(1-x/T)) .* (T/2<=x & x<=T);
x = linspace(0, 20);
X = repmat(x, 500, 8);
sv = s(X);
figure(1)
imshow(sv,[])
Note that in the repmat call, the second argument are the number of rows, and the third argument are the number of times the vector repeats horizontally.
ajeet verma
on 12 Jul 2017
Star Strider
on 12 Jul 2017
I would define a filled circle as:
a = linspace(0,2*pi,500);
r = 30;
x_circ = r*cos(a);
y_circ = r*sin(a);
figure(1)
fill(x_circ, y_circ, 'r')
axis equal
Experiment to get the result you want, then use the print function to save it in the image format you want.
ajeet verma
on 13 Jul 2017
ajeet verma
on 18 Jul 2017
Edited: ajeet verma
on 18 Jul 2017
Star Strider
on 18 Jul 2017
You are reconstructing a Fourier series. It will not have an infinite number of points.
With all due respect, if you are going to use MATLAB, you need to understand how to code that yourself. Please see the documentation on Getting Started (link).
There are much more efficient ways to code that. However for clarity, I would code it in a for loop. This runs, however I cannot guarantee that it will produce the result you want:
c = ...; % Array Of ‘c’ Values
phi = ...; % Array Of Phase Values
W0 = ...; % Fundamental Frequency
t = ...; % Time Row Vector
x(1,:) = c(1)*ones(1, numel(t));
for n = 2:numel(c)
x(n,:) = 2*abs(c(n))*cos(n*W0*t + phi(n));
end
x = sum(x);
ajeet verma
on 2 Aug 2017
Star Strider
on 2 Aug 2017
It is necessary to make a few changes in the code to do what you want.
This should work:
a = 0.1;
Scale = 6; % Repition Number (10 —> 60)
T = 20/Scale;
s = @(x) (2*a*x/T) .* (0<=x & x<=T/2) + (2*a*(1-x/T)) .* (T/2<=x & x<=T);
x = linspace(0, T, T*Scale);
X = repmat(x, 1000, 10*Scale);
sv = s(X);
figure(1)
imshow(sv,[])
ajeet verma
on 3 Aug 2017
More Answers (1)
ajeet verma
on 4 Aug 2017
0 votes
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