How to Make a function accept vector inputs
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function Ml = myseries(t)
n=0;
while (n<10)
Ml = sum(t.^n/(gamma(n + 1)));
n = n+1;
end
The above code runs well as long as the input variable is a scalar; for vectorized inputs, it fails. What might be wrong?
4 个评论
Azzi Abdelmalek
2013-12-21
What "It fails" means? is there any error message?
John D'Errico
2013-12-22
It isn't a question of MAKING it accept vector input. ANY function can always accept vector inputs. The issue is your code, making it work with vectors.
Ben
2017-3-29
sum(t.^n/(gamma(n + 1))) needs to have a . before the /
Walter Roberson
2017-3-29
./ would only be needed if the right hand side, gamma(n+1) was a vector or matrix, but in this context it is a scalar.
采纳的回答
Youssef Khmou
2013-12-21
You did not specify how the output should be , 1x1 or Nx1 , you can try this way :
function Ml = myseries(t)
n=0;
ctr=1;
while (n<10)
Ml(ctr) = sum(t.^n/(gamma(n + 1)));
n = n+1;
ctr=ctr+1;
end
更多回答（2 个）
Walter Roberson
2013-12-21
Your current code overwrites all of Ml each time through the "while" loop, and so is unlikely to be doing what you want.
for n = 0 : 9
Ml(n,:) = sum(t.^n/(gamma(n + 1)));
end
4 个评论
Chuzymatics Chuzymatics
2013-12-21
Youssef Khmou
2013-12-21
Just a small correction, @Walter, the index must start at 1.
Walter Roberson
2013-12-21
Right, sorry,
for n = 0 : 9
Ml(n+1,:) = sum(t.^n/(gamma(n + 1)));
end
Chuzymatics Chuzymatics
2013-12-22
Image Analyst
2013-12-21
编辑：Image Analyst
2013-12-21
I think you can to what you want to do with one of these functions. Not sure what you want to do so pick one:
function theSum = myseries(t)
% Vectorized method.
n = 1:length(t);
theSum = sum(t.^n ./ (gamma(n + 1)));
function theSum = myseries(t)
% For loop method.
theSum = 0;
for n = 1 : length(t)
theSum = theSum + t(n)^n ./ gamma(n + 1);
end
This does something completely different than the other two answers but I think is what you were actually intending, which is trying to sum a series.
5 个评论
Youssef Khmou
2013-12-21
i think the output should be a vector , if it was not the case, then a simple "sum(.....)" should suffice .
Image Analyst
2013-12-22
I'm not so sure. It looks like he's trying to sum a series, and that would give a single summed value. I think he wants the sum of the first 10 terms of t(n)^n/gamma(n+1). A 10 element array t is passed in and n goes from 1 to 10. At least that's how I interpret it. Why do you think he wants a vector?
Youssef Khmou
2013-12-23
it is guess, like i explained, if it was not a vector, no need for a question, a simple "sum(quantity)" is fine .
Image Analyst
2013-12-23
Well he accepted your interpretation so I guess you were right. The Ml(2) was the sum of terms 1 and 2, the Ml(3) was the sum of terms 1, 2, and 3, and the element Ml(N) was term1 + term2 + term3 + term4 +....+termN. I thought he wanted just one sum - the sum of terms 1 through term N - not N sums, but I guess I was wrong.
Youssef Khmou
2013-12-23
ok
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