Expression (equation)

1 次查看(过去 30 天)
Jan
Jan 2011-12-8
Hello, how to define an expression, for example 1-e^(-At) where I can define and change parameters A and t and than figure changes of the curve in a graph.
Thanks

采纳的回答

Paulo Silva
Paulo Silva 2011-12-8
Simplest version I can think of
t=0:0.1:100; % Time vector
A=0.1; % Value of A that you can change
plot(t,1-exp(-A(n)*t)) % Represent it on a figure
If you place the cursor on the value of A you can try several values using the Editor tools (look on the tools of your editor window - 1.0 + ... press those symbols and the script runs with a new value for A)
Just for fun here's a version using subplots
clf
t=0:0.1:10;
A=[0.01 0.1 0 1];
for n=1:4
subplot(2,2,n)
plot(t,1-exp(-A(n)*t))
title(['A=' num2str(A(n))])
end
  9 个评论
Paulo Silva
Paulo Silva 2011-12-8
It's just basic math, you use the Product block with inputs A and t and connect that block output to the Math Function block
Jan
Jan 2011-12-8
thx :)

请先登录,再进行评论。

更多回答(1 个)

Sean de Wolski
Sean de Wolski 2011-12-8
And to add on to Paulo's example:
t=0:0.1:100; % Time vector
A=0.1;
y = 1-exp(-A*t); % Value of A that you can change
H = figure;
plot(t,y)
linkdata(H,'on');
shg;
pause(2) %watch the magic in 2 seconds
A = .8;
y = 1-exp(-A*t);
if you want it to automagically update when you change A or y.
  3 个评论
Jan
Jan 2011-12-8
Thanks a lot Sean :)
Jan
Jan 2011-12-8
Is it possible to model it in the Simulink?

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Exponents and Logarithms 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by