Program to approximate e^x using the Taylor Series
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I am attempting to write a function called expSeries which uses another function factFunc to evaluate e^x. I have already written the function factFunc, as shown below:
function fact = factFunc(n)
f = 1;
for a = 1:b
f = f*a;
end
fact = f;
end
I am now attempting to write the function expSeries which evaulates e^x using the Taylor series. This is what I have so far:
function expo = exponentialFunc(x)
terms = input('Enter the number of terms');
b = 0;
for i = 1:terms
b = x/factFunc(terms);
end
expo = b;
end
And in the main program, I have
n = exponentialFunc(4);
disp(n);
Where in this instance I am trying to find e^4. However, the output is not what expected. Does anyone have any idea where I am going wrong?
回答（2 个）
Walter Roberson
2018-11-8
Taylor series involve the sum of terms but your
for i = 1:terms
b = x/factFunc(terms);
end
Is overwriting all of b each cycle.
3 个评论
Walter Roberson
2018-11-8
? You would use i not n
Torsten
2018-11-8
for a = 1: *b*
should read
for a = 1: *n*
Best wishes
Torsten.
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