MATLAB: Multiple plots are not showing in the code

extrapilationmultiplenot showingplotplotsplottingsubplot

Hi, so I have to write a code in which I have multiple plots needed to be shown in a single subplot square. I've tried using hold on and figure, and plotting them in a single plot function. When I use hold on, no function shows! But when I plot them all together, only the last one shows. Please, help? I may have used spline wrong, but I just would really like to see the graphic representation of these extrapilations before I fix everything else. Also, I code in script form:
clear clc
x = linspace(0, 4*pi)
y = sin(x)
c = 'yrbgk'
ax = [0, 14, -2, 2]
axis(ax)
l = length(x)
o = l ./ 5
t = (2.*l)./5
th = (3.*l)./5
f = (4.*l)./5
fi = (5.*l)./5
cc = c(1)
cd = c(2)
ce = c(3)
cf = c(4)
cg = c(5)
omg = x(1:o)
zomg = x(1:t)
golly = x(1:th)
gee = x(1:f)
goshers = x(1:fi)
% all five pieces of data and colors %first extrap
subplot(3,1,1)
yout = interp1(x, y, omg, 'linear', 'extrap')
youtu = interp1(x, y, zomg, 'linear', 'extrap')
youtub = interp1(x, y, golly, 'linear', 'extrap')
youtube = interp1(x, y, gee, 'linear', 'extrap')
plot(omg,yout,cc)
hold on
plot(zomg,youtu,cd)
hold on
plot(golly,youtub,ce)
hold on
plot(gee,youtube,cf)
hold on
plot(goshers,y,cg)
figure
xlabel('x values')
ylabel('y values')
title('Interp1: Linear')
%second extrap
subplot(3,1,2)
yout = interp1(x, y, omg, 'cubic', 'extrap')
youtu = interp1(x, y, zomg, 'cubic', 'extrap')
youtub = interp1(x, y, golly, 'linear', 'extrap')
youtube = interp1(x, y, gee, 'cubic', 'extrap')
plot(omg,yout,cc,zomg,youtu,cd,golly,youtub,ce,gee,youtube,cf,goshers,y,cg)
xlabel('x values')
ylabel('y values')
title('Interp2: Cubic')
%third extrap
subplot(3,1,3)
yout = spline(x, y, omg)
youtu = spline(x, y, zomg)
youtub = spline(x, y, golly)
youtube = spline(x, y, gee)
plot(omg,yout,cc,zomg,youtu,cd,golly,youtub,ce,gee,youtube,cf,goshers,y,cg)
xlabel('x values')
ylabel('y values')
title('Interp3: Spline')

Best Answer

It looks like your data are plotted right on top of each other. See:
clear clc
x = linspace(0, 4*pi);
y = sin(x);
c = 'yrbgk'
l = length(x);
o = l ./ 5;
t = (2.*l)./5;
th = (3.*l)./5;
f = (4.*l)./5;
fi = (5.*l)./5;
cc = c(1);
cd = c(2);
ce = c(3);
cf = c(4);
cg = c(5);
omg = x(1:o);
zomg = x(1:t);
golly = x(1:th);
gee = x(1:f);
goshers = x(1:fi);
% all five pieces of data and colors %first extrap
figure
subplot(3,1,1)
yout = interp1(x, y, omg, 'linear', 'extrap')
youtu = interp1(x, y, zomg, 'linear', 'extrap')
youtub = interp1(x, y, golly, 'linear', 'extrap')
youtube = interp1(x, y, gee, 'linear', 'extrap')
plot(omg,yout+1,cc)   % <-- * * * HERE I CHANGED IT TO youtu+1  * * * 
hold on
plot(zomg,youtu,cd)
A work around would be to plot the shorter snippets of data last, so the longer lines don't perfectly cover them up.
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