Trying to change the y axis range in fplot

This is the code

clear all

clc

close all

syms s a b c d e f

n10 = a + (b*s) + c*(s^2) + d*(s^3) + e*(s^4) + f*(s^5)

n10_d1 = diff(n10,s)

n10_d2 = diff(n10_d1,s)

A = subs(n10,s,-1)

B = subs(n10,s,1)

C = subs(n10_d1,s,-1)

D = subs(n10_d1,s,1)

E = subs(n10_d2,s,-1)

F = subs(n10_d2,s,1)

eqn1 = A == 0;

eqn2 = B == 0;

eqn3 = C == 1;

eqn4 = D == 0;

eqn5 = E == 0;

eqn6 = F == 0;

[G,H] = equationsToMatrix([eqn1, eqn2, eqn3, eqn4, eqn5, eqn6], [a, b, c, d, e, f])

X = linsolve(G,H)

x = [1;s;s^2;s^3;s^4;s^5]

N3 = transpose(X)*x

hold on

fplot(N3,[-1 1])

It plots automatically between y = 0 and y = 0.4

I want to plot it between y= -1 and y = +1

The purpoe is comparison with other existing graphs that are between -1<=y<=1

Running it on MATLAB online

Please help

Answer 1

[Star Strider]

See if ylim will do what you want —

syms s a b c d e f
n10 = a + (b*s) + c*(s^2) + d*(s^3) + e*(s^4) + f*(s^5)

n10 = 

n10_d1 = diff(n10,s)

n10_d1 = 

n10_d2 = diff(n10_d1,s)

n10_d2 = 

A = subs(n10,s,-1)

A = 

B = subs(n10,s,1)

B = 

C = subs(n10_d1,s,-1)

C = 

D = subs(n10_d1,s,1)

D = 

E = subs(n10_d2,s,-1)

E = 

F = subs(n10_d2,s,1)

F = 

eqn1 = A == 0;
eqn2 = B == 0;
eqn3 = C == 1;
eqn4 = D == 0;
eqn5 = E == 0;
eqn6 = F == 0;
[G,H] = equationsToMatrix([eqn1, eqn2, eqn3, eqn4, eqn5, eqn6], [a, b, c, d, e, f])

G = 

H = 

X = linsolve(G,H)

X = 

x = [1;s;s^2;s^3;s^4;s^5]

x = 

N3 = transpose(X)*x

N3 = 

% hold on
fplot(N3,[-1 1])
ylim([-1 1])                                        % ADDED
grid                                                % ADDED

.

[Saim]

Thanks a lot

[Star Strider]

As always, my pleasure!

Answer 2

[Chunru]

syms s a b c d e f
n10 = a + (b*s) + c*(s^2) + d*(s^3) + e*(s^4) + f*(s^5)

n10 = 

n10_d1 = diff(n10,s)

n10_d1 = 

n10_d2 = diff(n10_d1,s)

n10_d2 = 

A = subs(n10,s,-1)

A = 

B = subs(n10,s,1)

B = 

C = subs(n10_d1,s,-1)

C = 

D = subs(n10_d1,s,1)

D = 

E = subs(n10_d2,s,-1)

E = 

F = subs(n10_d2,s,1)

F = 

eqn1 = A == 0;
eqn2 = B == 0;
eqn3 = C == 1;
eqn4 = D == 0;
eqn5 = E == 0;
eqn6 = F == 0;
[G,H] = equationsToMatrix([eqn1, eqn2, eqn3, eqn4, eqn5, eqn6], [a, b, c, d, e, f])

G = 

H = 

X = linsolve(G,H)

X = 

x = [1;s;s^2;s^3;s^4;s^5]

x = 

N3 = transpose(X)*x

N3 = 

hold on
fplot(N3,[-1 1])
ylim([-1 1])  %<=====================