How to use the "subplot" and "arrayfun" command correctly?

1 次查看(过去 30 天)
Hi, I'm wondering if someone can assist me with debugging this Error I received when I ran this .m file program. The code is below:
Ts = [0.05 0.01 0.001]; % Define sampling time, Ts = 0.05 seconds.
TT = 1; % Define total time, TT = 1 second.
f = 2; % Define frequency, f = 2 Hz.
t = 0:Ts:1; % Generate the time vector.
S = arrayfun(t, Ts); % Applies the function, t, to the elements
% of S, one element at a time.
% arrayfun concatenates the outputs from t into the output array S, so that
% for the ith element of Ts, S(i)=t(Ts(i)).
x = sin(2*pi*f*t); % Generate the desired 2 Hz sine wave.
plot (S,x,'.k') % Plot the sine wave as discrete points.
xlabel 'Time (s)' % and label the (x) and (y) axes.
ylabel 'x(t)'
I'm receiving 1 warning in Line 4 that states: "Variable 'Ts' might be set by a nonscalar operator." And 1 Error that states:
"Error using arrayfun"
First input must be a function handle.
Does anyone know how I can possibly fix this Error?
All I'm trying to do is create a subplot of 3 different plots of a discrete 2-Hz sine wave (one for each sampling time [0.05, 0.01, 0.001]) on 1 single plot. I need to create the subplot so I plot with lines connecting the points, and on the same plot, the individual points should be superimposed on the line curves. I need to plot the sine waves using the 3 sample intervals separately but I need to use 'subplot' to keep the 3 plots together in 1 Figure.
I hope that doesn't sound too confusing. If you need some clarification, please let me know. I'm not sure how to use the 'subplot' command correctly. Thanks!
  2 个评论
Rik
Rik 2018-2-1
Have you read the documentation? That is always a good start. Here, the error is also illuminating: t must be a function handle (or an anonymous function), but it isn't. I can't cell what function you would want to use here, but this isn't a function.
Michael
Michael 2018-2-1
Yeah, I'm reading the documentation right now. I just need 3 plots in 1 Figure: 1 plot for each sampling time.
And I'm not sure how I can do that without maybe declaring each sampling time separately - but then that lengthens my code considerably because then I have to create 3 different time vectors for the 3 different sine waves.
I'm just trying to get the sine wave generated and the 3 plots made into a single plot Figure using a "Ts" array containing the 3 different sampling times (one sampling time per plot).

请先登录,再进行评论。

回答(1 个)

Rik
Rik 2018-2-2
Do you mean something like this? (note that I changed the input to plot, as well as the creation of t)
Ts = [0.05 0.01 0.001]; % Define sampling time, Ts = 0.05 seconds.
TT = 1; % Define total time, TT = 1 second.
f = 2; % Define frequency, f = 2 Hz.
for Ts_i=1:numel(Ts)
t = 0:Ts(Ts_i):TT; % Generate the time vector.
x = sin(2*pi*f*t); % Generate the desired 2 Hz sine wave.
subplot(3,1,Ts_i)
plot (t,x,'.k') % Plot the sine wave as discrete points.
xlabel 'Time (s)' % and label the (x) and (y) axes.
ylabel 'x(t)'
end

类别

Help CenterFile Exchange 中查找有关 Analyze Data 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by