How to plot a curved signal ?
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Biro Darius
on 15 Oct 2018
Commented: Image Analyst
on 25 Oct 2018
Can anybody tell me how can I plot a signal like that one represented in the figure below ? I just need the part of the signal from 10 to 15. I have the following code until now :
time = 0:0.1:15;
xArray = zeros(1,numel(time)); %numel gives the number of the elements that an array has
for index = 1:numel(time)
if(time(index)>5 && time(index)<7)
xArray(index) = (time(index)-5)/2;
elseif(time(index))>= 7 && (time(index))<10
xArray(index) = 1;
elseif ((time(index) >= 10 && time(index)<15))
xArray(index) = (15 - time(index))/5;
end
end
figure (2)
plot(time,xArray);
axis([0 15 0 5]);
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Accepted Answer
Image Analyst
on 15 Oct 2018
Try this:
numPoints = 1000;
times = linspace(0, 15, numPoints);
xArray = zeros(1,numel(times)); % numel gives the number of the elements that an array has
for index = 1 : numel(times)
if times(index) > 5 && times(index) < 7
xArray(index) = (times(index)-5)/2;
elseif times(index) >= 7 && times(index) < 10
xArray(index) = 1;
elseif ((times(index) >= 10 && times(index)<15))
a = 0.7; % Smaller for flatter, larger for steeper
xArray(index) = exp(-a * (times(index) - 10));
end
end
plot(times, xArray, 'b-', 'LineWidth', 2);
xlim([0, 15]);
ylim([0, 2]);
ax = gca;
ax.YTick = [0 1];
ax.XTick = [5 7 10 15];
ax.FontSize = 15;
grid on;
xlabel('f[Hz]', 'FontSize', 15);
ylabel('x', 'FontSize', 15);
title('xArray vs. Time', 'FontSize', 15);
More Answers (2)
Akira Agata
on 15 Oct 2018
How about the following?
figure
plot(time,xArray)
ax = gca;
ax.YTick = [0 1];
ax.XTick = [5 7 10 15];
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Biro Darius
on 18 Oct 2018
3 Comments
Image Analyst
on 25 Oct 2018
Yes, he wants you to do it "manually" instead of having the ifft() function do it for you.
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