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using operators (+,-,*,/) in variables

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Alex
Alex 2014-12-3
回答： Azzi Abdelmalek 2014-12-3
Hi, if i need to config for + to be 'op' for example how can i then use it as an actual + further down the code?
example
op='+';
a=1;
b=2;
c=a(+ as op)b;

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采纳的回答

Guillaume
Guillaume 2014-12-3
Use str2fun to change your string into a function handle. Note that the string content must be a valid matlab function name ( '+' is)
op = '+';
a = 1;
b = 2;
opfn = str2fun(op);
c = opfn(a, b);
There is no way to have it
c = a opfn b; %can't be done in matlab
  2 个评论
Guillaume
Guillaume 2014-12-3
Note that if you don't require to start with a string, you could just define opfn as:
opfn = @plus; %@minus, @times, @rdivide for elementwise -, *, / respectively
Sean de Wolski
Sean de Wolski 2014-12-3
Use this approach of opfun = @plus or whatever.

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-12-3
You can create this function
function y=op(a,b,operator)
if operator=='+'
y=a+b
elseif operator=='-'
y=a-b
elseif operator=='/'
y=a/b
elseif operator=='*'
y=a*b
end
% And call it
y=op(5,6,'+')

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