Eventhough i used syntax for plotting xlabel, ylabel , title but its not visible in the graph

clear 
clc
syms x y
f(x)=input('Enter the function:');
I=input('Enter the interval:');
a=I(1);b=(2);
Df=diff(f,x);
m=(f(b)-f(a))/(b-a);
c=solve(Df==m, x);
c=c(a<c&c<b);
disp('Values of c lying in the interval I are');
disp(double(c));
T=f(c)+m*(x-c);
disp('The tangent Lines at c are');
disp(vpa(y==T,4));
figure
fplot(f,I); grid on; hold on;
fplot(T, I, 'r');
plot(c,double(f(c)), 'ko');
plot(I,double(f(I)), 'm');
xlabel('x'); ylabel('y');
title('Demonstration of Mean value theorem');

[Walter Roberson]

What function and interval are you using?

[NITISH B]

function is x+exp(3*x)

interval is [0,1]

[NITISH B]

x label ylabel title also i am not getting in the graph...Whats the problem?

Answer 1

[Walter Roberson]

Works for me.

syms x y
f(x)= x+exp(3*x) %input('Enter the function:');

f(x) = 

I= [0,1] %input('Enter the interval:');

I = 1×2

0 1

a=I(1);b=(2);
Df=diff(f,x);
m=(f(b)-f(a))/(b-a);
c=solve(Df==m, x);
c=c(a<c&c<b);
disp('Values of c lying in the interval I are');

Values of c lying in the interval I are

disp(double(c));

    1.4019

T=f(c)+m*(x-c);
disp('The tangent Lines at c are');

The tangent Lines at c are

disp(vpa(y==T,4));

figure
fplot(f,I); grid on; hold on;
fplot(T, I, 'r');
plot(c,double(f(c)), 'ko');
plot(I,double(f(I)), 'm');
xlabel('x'); ylabel('y');
title('Demonstration of Mean value theorem');

[NITISH B]

But i am not getting this😞.. What's the problem I don't know

Answer 2

[Cris LaPierre]

It works fine for me

clear 
clc
syms x y
f(x)=x.^2; % modified so code runs here
I=[0 10]; % modified so code runs here
a=I(1);b=(2);
Df=diff(f,x);
m=(f(b)-f(a))/(b-a);
c=solve(Df==m, x);
c=c(a<c&c<b);
disp('Values of c lying in the interval I are');

Values of c lying in the interval I are

disp(double(c));

     1

T=f(c)+m*(x-c);
disp('The tangent Lines at c are');

The tangent Lines at c are

disp(vpa(y==T,4));

figure
fplot(f,I); grid on; hold on;
fplot(T, I, 'r');
plot(c,double(f(c)), 'ko');
plot(I,double(f(I)), 'm');
xlabel('x'); ylabel('y');
title('Demonstration of Mean value theorem');

[NITISH B]

Then y I am not getting that?.. Whether my matlab has any error?.. How to solve that problem

[NITISH B]

Sir,now i copied ur same syntax and i pasted in my matlab and i run the program ....That time also i am not getting the pink and red line in graph only the blue line i am getting.

[Walter Roberson]

Could you remind us which MATLAB release you are using?

Also, does "hold on" generally work for you? For example what happens if you try

plot(rand(1,30), 'displayname', 'first')
hold on
plot(rand(1,30), 'displayname', 'second')
plot(rand(1,30), 'displayname', 'third')
hold off
legend show

[NITISH B]

I am using matlab online only I didnt downloaded it...I tried the syntax given by you sir ,but in graph only blue line i am getting not the red and orange.

[Walter Roberson]

I just tried it myself in MATLAB Online, and got all three lines.

When you are on MATLAB Online, what shows up if you command

which plot
which hold

[NITISH B]

built-in (/MATLAB/toolbox/matlab/graph2d/plot)

/MATLAB Drive/hold.m

like this for me showing in command window..by using which plot which hold

Answer 3

[Walter Roberson]

You have your own hold.m that is interfering with the Mathworks command. You need to rename it or delete it or put it in a directory named "private" in the code that needs it.

[NITISH B]

How to do that?..Can u say it briefly?

[Walter Roberson]

movefile('/MATLAB Drive/hold.m', '/MATLAB Drive/was_named_hold.m')

[NITISH B]

wow!!...Its working now ...Thanks a lot!! Sir..