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How can I plot this exponential decaying sinusoid

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Nabin SUNAM
Nabin SUNAM 2015-1-30
评论： Mischa Kim 2015-1-31
y(x) = F * exp^(-a*x) * sin(bx)
pick you own values for x vector.
value of a and b:
ethyl alcohol 0.246 0.806
water 0.250 1.000
Oil 0.643 1.213
plot using the values above for each fluid.
Here is a portion of my approach.
extf = input('Please enter the magnitude of the external force: ');
yethylalchol == extf*exp(-0.246*x).*sin(0.806*x);
plot( x,yethylalcohol,'c*' )
hold on
ywater == extf*exp(-0.250*x).*sin(1*x);
plot( x,ywater,'r+' )
hold on
yoil == extf*exp(-0.643*x).*sin(1.213*x);
plot( x,yoil, 'yp')
What am I doing wrong? Help please!!!

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采纳的回答

Mischa Kim
Mischa Kim 2015-1-30
Nabin, how about
% value of a and b:
% ethyl alcohol 0.246 0.806
% water 0.250 1.000
% Oil 0.643 1.213
F = 1;
x = 0:0.1:2*pi;
a = [0.246 0.250 0.643]';
b = [0.806 1.000 1.216]';
y = F * exp(-a*x).*sin(b*x);
plot(x,y)

更多回答（1 个）

Nabin SUNAM
Nabin SUNAM 2015-1-30
Thanks Miscah for the try. I tried to run this script and this is the message I'm getting.
"Error using *
Inner matrix dimensions must agree."
I wonder what it means.
  1 个评论
Mischa Kim
Mischa Kim 2015-1-31
Nabin, did you re-type the script (as opposed to doing a copy-paste)? You might have missed a dot or prime.

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