How do I add a for loop to do subplots

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Dalton Houghton-Schaffer
编辑： Adam Danz 2020-2-21
Create a subplot with two graphs subplot(2,1,x). The top plot will be your summed sinusoids and the bottom will show all the sinusoids used to create the final sinusoid. To do this, use the for loop to create a matrix that contains three vectors, one for each of the base sinusoids. Then use one command (outside your function) to plot all three together on the bottom subplot.
My code is below but I am unsure how or where to add a for loop to execute this. My thought was to store the "x" value and then plot it.
function [xx,tt] = syn_sin(fk,xk,fs,dur,tstart)
if nargin <5, tstart=0, end
if length (xk)~= length(fk)
error ('error', 'fk~=xk');
end
t= tstart: 1/(fs):dur;
x=xk(1)* exp(2*j*pi*fk(1)*t);
for k=2:length(fk);
x=xk(k) *exp(2*j*pi*fk(k)*t) +x;
end
plot(t,x),grid on

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Adam Danz
Adam Danz 2020-2-20
编辑：Adam Danz 2020-2-20
The general template to build subplots within a loop
nrows = 2; % number of subplot rows
ncols = 1; % number of subplot columns
nsubs = nrows * ncols; % total number of subplots
for i = 1:nsubs
subplot(nrows, ncols, i)
plot(. . .)
end
For r2019b or later, you can used tiledlayout
nrows = 2; % number of subplot rows
ncols = 1; % number of subplot columns
nsubs = nrows * ncols; % total number of subplots
tiledlayout(nrows, ncols)
for i = 1:nsubs
nexttile()
plot(. . .)
end
Let me know if there are any questions | problems.
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Adam Danz
Adam Danz 2020-2-21
编辑：Adam Danz 2020-2-21
My bet is that the variable j was not assigned a value. By default, j is an imaginary unit.
Dalton Houghton-Schaffer
Dalton Houghton-Schaffer 2020-2-21
Thank you so much!!! Yes I always forget to reassign j for i.

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