how to use the mathmatical constant "e" in conjunction with a vector.
显示 更早的评论
I am trying to use the mathmatical constant "e" in conjunction with a vector and each time i rum my script i tells me that the " * " is wrong. I have narrowed it down by removign things one piece at a time and everything runs great until i add the e back into my script. i saw somewhere that you can use exp() to make it work but in conjunction with the rest of the function i am not getiing it to work.
采纳的回答
Matt Tearle
2012-8-29
Your problem isn't the e, it's that the two parts you're trying to multiply are both vectors, hence you need .* instead of *:
f = 22*cos(15*pi*t) .* e.^(-0.5*t);
% ---vector--- ---vector--
But, as Wayne King says, don't use e.^x, use exp(x):
f = 22*cos(15*pi*t) .* exp(-0.5*t);
更多回答（1 个）
Wayne King
2012-8-29
编辑：Wayne King
2012-8-29
You need to post some code so we can see where you encounter an error. You can certainly use exp() with vectors.
x = 1:0.001:10;
y = exp(x);
% or
z = exp(1)*ones(100,1);
Of course, you can always define a variable.
e = exp(1);
but I don't think you should need to do that.
Also, don't forget the "dot" notation if that is necessary.
x = 1:0.001:10;
y = exp(-x.^2);
plot(x,y)
类别
在 帮助中心 和 File Exchange 中查找有关 Logical 的更多信息
2012-8-29
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
