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Calculate Exponentials WITHOUT built-in exponent function?

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Dillan Masellas
Dillan Masellas 2016-4-8
评论： Walter Roberson 2022-1-6
Greetings!
I am new to MATLAB and going in circles trying to logic my way what should be a simple function:
How do I calculate, using a "for" loop, x^k?
My function inputs are ( x, n ); I start with:
% code
ExpValue = 0;
k = 1;
for i = 1:n;
ExpValue = ExpValue + ?
end
Recall that I must use a Sum for the exponential function... x*1, x*x, x*x*x all the way to squaring x up to n times.
Thanks!

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采纳的回答

Roger Stafford
Roger Stafford 2016-4-9
编辑：Roger Stafford 2016-4-9
Trying to compute x^n using only summation is a terrible method. Surely you would be allowed to use multiplication!
ExpValue = 1;
for k = 1:n % (Corrected)
ExpValue = ExpValue*x;
end
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Life is Wonderful
Life is Wonderful 2022-1-6
Ran in:
This doesn't work for fractional case
n = 10.2
n = 10.2000
x = 2.5;
x ^ n
ans = 1.1455e+04
ExpValue = 1;
for k = 1:n % (Corrected)
ExpValue = ExpValue*x;
end
ExpValue
ExpValue = 9.5367e+03
Walter Roberson
Walter Roberson 2022-1-6
True, but the original poster only needed integral powers as they were developing a series approximation to exp()

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