How to create a function handle for thermodynamics(semi-infinite heat conduction) using erfc with multiple variables?

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Henry B. 2021-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/841125-how-to-create-a-function-handle-for-thermodynamics-semi-infinite-heat-conduction-using-erfc-with-mu

编辑： Torsten 2021-5-28

采纳的回答： Torsten

%So my initial guess would be to create arrays or vectors for t, x, and alpha and try to pass those values through function handle something like :

thetafh = @(x,t,alpha) erfc(x/sqrt(4*alpha*t))

This is part of my final and any help is greatly appreciated please and thank you.

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Henry B. 2021-5-27

good to know I thought they were the same coding language as my class is taught as octave/matlab.

Henry B. 2021-5-27

在 MATLAB Online 中打开

function [Theta] = InfConduct(x,t,alpha)
  tfh = @(x,t,alpha) erfc(x./sqrt(4 .*alpha.*t))
  Theta=0;
  for k = 1:size(t)
    Theta(k+1) = Theta(k) + tfh(k+1)
  end
  end

This is the code I have tried and when I try to use the example code in the command line it generates a function handle error.

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Torsten 2021-5-27

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编辑：Torsten 2021-5-27

Use ./ instead of / in your definition of thetafh.

But you are asked to write a function, not a function handle.

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Henry B. 2021-5-28

thank you so much its matching with inputs listed and match the erfc function values

Torsten 2021-5-28

编辑：Torsten 2021-5-28

I wonder why you sum up the theta values.

A call to your function handle with t(i) already gives you the dimensionless temperature.

The fact that you get dimensionless temperatures that exceed the value of 1 show that your summation must be wrong.

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