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

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NITISH B 2021-10-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470406-eventhough-i-used-syntax-for-plotting-xlabel-ylabel-title-but-its-not-visible-in-the-graph

评论： NITISH B 2021-10-10

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');

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NITISH B 2021-10-10

function is x+exp(3*x)

interval is [0,1]

NITISH B 2021-10-10

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

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采纳的回答

Walter Roberson 2021-10-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470406-eventhough-i-used-syntax-for-plotting-xlabel-ylabel-title-but-its-not-visible-in-the-graph#answer_805296

在 MATLAB Online 中打开

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');

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NITISH B 2021-10-10

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

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更多回答（2 个）

Cris LaPierre 2021-10-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470406-eventhough-i-used-syntax-for-plotting-xlabel-ylabel-title-but-its-not-visible-in-the-graph#answer_805086

在 MATLAB Online 中打开

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));

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');

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Walter Roberson 2021-10-10

在 MATLAB Online 中打开

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 2021-10-10

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

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Walter Roberson 2021-10-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1470406-eventhough-i-used-syntax-for-plotting-xlabel-ylabel-title-but-its-not-visible-in-the-graph#answer_805521

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.