How to change mathematical symbols of division (/ to ./) and multiplication(* to .*) in a very long formula obtained by symbolic tool.

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Mahak SINGH CHAUHAN 2014-3-27

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https://ww2.mathworks.cn/matlabcentral/answers/123366-how-to-change-mathematical-symbols-of-division-to-and-multiplication-to-in-a-very-long

评论： Joseph Cheng 2014-3-27

I am using symbolic toolbox in order to write a formula and differentiation etc. After I have to use my final formula in a function. But in obtained formula by symbolic toolbox, symbol of division and multiplication are / and * respectively. When I put the values of a variable in vector or matrix form, It gives the error. So I have to change the symbols manually for example / (division) to ./ and * (multiply) to .*

Is there any alternate way to solve this problem. Thanks in advance.

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Answer 1

Mischa Kim 2014-3-27

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Mahak, copy-paste the formula into a script/function editor and use CTRL+F to replace the strings.

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Mahak SINGH CHAUHAN 2014-3-27

Thank You very much Mischa, I also did same just after putting question here. Thanks again for your reply.

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Answer 2

Joseph Cheng 2014-3-27

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编辑：Joseph Cheng 2014-3-27

在 MATLAB Online 中打开

to do this you can do something like this.

textEquation=char(symsEquation);
division = [0 strfind(textEquation,'/')];
elbyelDivEquation=[];
for i =1:length(division)-1
    elbyelDivEquation = [elbyelDivEquation textEquation(division(i)+1:division(i+1)-1) './'];
end

elbyelDivEquation=syms(elbyelDivEquation);

I did the / substitution quickly so didn't verify if it actually does capture whats between the / and then inserts the other portions. but that should do the trick.

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Mahak SINGH CHAUHAN 2014-3-27

Thank You Joseph.. It may also be another way to change.

Joseph Cheng 2014-3-27

if this is a one off then Mischa Kim solution would be easier. However if this is going to happen routinely (say in a program or multiple runs in a script) you may want to automate it.

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