Multiple plots are not showing in my code?

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')

Answer 1

[Chad Greene]

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.