Converting equation to matlab

Question

Christos Papedo 2019-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/482481-converting-equation-to-matlab

回答： SUFIZATUL AIN MAMAT 2022-4-26

Hi, I am trying to convert the following equation to matlab code. I have a bunch of defined constants above this code but I am trying to figure out if my formatting is correct since I keep getting the wrong answer. I need to multiply the two functions and they are dependant on the variable E, everything else is a constant. Thanks!

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Jon 2019-9-27

编辑：Jon 2019-9-27

For the future, it is good to use the insert code button on the Answers toolbar to insert code rather than using a screen shot. Then people can easily copy and paste from there to try your code without having to retype it.

madhan ravi 2019-9-27

Always post the code, don’t let others type the same code.

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Answer 1

Jon 2019-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/482481-converting-equation-to-matlab#answer_393800

编辑：Jon 2019-9-27

在 MATLAB Online 中打开

% note .* to get element by element multiplication
% ./ for element by element division
g = 1.0/(2*pi^2*h^3)*(2*m)^(3/2)*sqrt(E-Ec) 
f = 1.0 ./(1+exp((E-Ef)/(k*T))) 
N = g.*f 

Sorry I didn't notice you already had some code for N = g.*f at the bottom of your original post, I just saw the typeset equations. Maybe this is equivalent what you already have. If so I guess there is a problem in your definition of the constants. In any case you have some unecessary parenthesis and also the ./ in your first equation is not needed when the denominator is a scalar.

You also have some apparently unecessary parentheses in your definition of the constants. This is a good reference on Matlab's precedence rules https://www.mathworks.com/help/matlab/matlab_prog/operator-precedence.html