How to Make a function accept vector inputs

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Chuzymatics Chuzymatics 2013-12-21

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https://ww2.mathworks.cn/matlabcentral/answers/110358-how-to-make-a-function-accept-vector-inputs

评论： Walter Roberson 2017-3-29

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
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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.

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Youssef Khmou 2013-12-21

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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

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https://ww2.mathworks.cn/matlabcentral/answers/110358-how-to-make-a-function-accept-vector-inputs#answer_119042

在 MATLAB Online 中打开

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
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Walter Roberson 2013-12-21

在 MATLAB Online 中打开

Right, sorry,

for n = 0 : 9
  Ml(n+1,:) = sum(t.^n/(gamma(n + 1)));
end

Chuzymatics Chuzymatics 2013-12-22

I am proud to belong to this community; you all are legends. Many thanks

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Image Analyst 2013-12-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/110358-how-to-make-a-function-accept-vector-inputs#answer_119050

编辑：Image Analyst 2013-12-21

在 MATLAB Online 中打开

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.

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