Arithmetic to Functional Converter
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I was wondering if anyone knows of a way to convert arithmetic to functional synatx. For example, I'd like to convert the string
'a+b'
to
'plus(a,b)'
Now, this was a very simple example. It gets a bit harder with more "complicated" expressions.
'a+b.*c'
becomes:
'plus(a,times(b,c))'
I assume MATLAB already does this, under the hood somewhere. There should be a way (either documented or not) to access this. Any insights?
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Walter Roberson
el 26 de Mzo. de 2012
You might be able to get something useful by hacking the source to mtree:
Más respuestas (3)
owr
el 27 de Mzo. de 2012
Are you just trying to evaluate algebraic statements provided in string format?
If so, try "eval":
>> a = 4
a =
4
>> b = 6
b =
6
>> str = 'a+b'
str =
a+b
>> eval(str)
ans =
10
John D'Errico
el 27 de Mzo. de 2012
Its easy, IF you look at this the right way.
First, pre-parse the expression to determine that 'a+b.*c' has three variables in it, a, b, and c. Define objects a, b and c. Now overload the plus and times operators to actually use bsxfun.
Finally, let MATLAB do the operation, using an eval. You CAN make this work, but you will need to be careful and think it out.
anisa
el 31 de Mayo de 2012
Hi, Did you manage to find a method in MATLAB that already implements this. I am trying to do the same thing I am sure that somewhere in matlab there should already be a method. If you could let me know that would be greatly appreciated.
1 comentario
Walter Roberson
el 31 de Mayo de 2012
I, on the other hand, am "sure" that there is no documented MATLAB method to do this (other than what John outlined.)
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