Why doesn't my plot turn out the way it should?

I have been stuck at this for hours and i can't figure out what's the issue. Would be glad if anyone here can enlighten me!

clc

clear

%creating matrices for Solid-State Rate and Integral Expressions for Different Reaction Models

syms a t

M = [2*a^(1/2), 3*a^(2/3), 4*a^(3/4)];

K = 1./M;

I = int(K);

%making alpha the subject of the equation

eqn(1) = (I(1) == t);

v_a = solve(eqn(1), a);

%plotting alpha against time

t = linspace(0,10,1000);

fplot(t, v_a);

xlabel('t');

ylabel('f(x)');

title('Plot of the f(x)');

So is my code and the issue is that i can't get the shape of the plot out right. The expression for v_a is correct, but the plot isn't. Help!!

[Kevin Chng]

Hi,

i'm not sure whether i can help you or not.

clc
clear all
%creating matrices for Solid-State Rate and Integral Expressions for Different Reaction Models
syms a t
M = [2*a^(1/2), 3*a^(2/3), 4*a^(3/4)];
K = 1./M;
I = int(K);
%making alpha the subject of the equation
eqn(1) = (I(1) == t);
v_a = solve(eqn(1), a);
%plotting alpha against time
% t = linspace(0,10,1000);
fplot(v_a,[0 10]);
xlabel('t');
ylabel('f(x)');
title('Plot of the f(x)');

Is it the shape you want? I guess you might confuse to use fplot.

[cubehz94]

IT WORKS!!! Thank you. I do not understand how does this syntax work though

Answer 1

[Kevin Chng]

Hi

clc
clear all
%creating matrices for Solid-State Rate and Integral Expressions for Different Reaction Models
syms a t
M = [2*a^(1/2), 3*a^(2/3), 4*a^(3/4)];
K = 1./M;
I = int(K);
%making alpha the subject of the equation
eqn(1) = (I(1) == t);
v_a = solve(eqn(1), a);
%plotting alpha against time
% t = linspace(0,10,1000);
fplot(v_a,[0 10]);
xlabel('t');
ylabel('f(x)');
title('Plot of the f(x)');

I repost my solution here again as it works for you. You may refer to documentation https://www.mathworks.com/help/matlab/ref/fplot.html

[cubehz94]

ah, okay thanks a bunch