How to find a Y value of a given X?
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Rishab Vadvadgi
on 17 Sep 2020
Commented: Star Strider
on 17 Sep 2020
Hello, this is a very simple question. I am writing an equation for v given t:
t = 0:0.00001:0.01;
v= 50*exp(-1600*t) - 50*exp(-400*t);
How would I find the value of v at a certain t? I want to find what v is when t=0.000625.
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Accepted Answer
Star Strider
on 17 Sep 2020
This is easiest if you create ‘v’ as an anonymous function:
t = 0:0.00001:0.01;
v = @(t) 50*exp(-1600*t) - 50*exp(-400*t);
ti = 0.000625;
Out = v(ti)
figure
plot(t, v(t))
hold on
plot(ti, v(ti), 'r+')
hold off
grid
3 Comments
Star Strider
on 17 Sep 2020
My pleasure!
To calculate with functions, it is necessary to evaluate them to do the calculation:
p = @(t) v(t).*i(t);
That works. Note also the use of element-wise multiplication, .* instead of * .
Example —
figure
plot(t, p(t))
grid
.
More Answers (2)
Johannes Fischer
on 17 Sep 2020
So in your case:
% define the anonymous function
v = @(t) 50*exp(-1600*t) - 50*exp(-400*t);
% call it
v(0.000625)
BOB MATHEW SYJI
on 17 Sep 2020
Hope this helps. x is the input and sol is the value of v at x (in this case x=0.000625)
syms v(t)
x=0.000625;
v(t)= 50*exp(-1600*t) - 50*exp(-400*t);
sol=double(v(x));
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