|Subject:||Re: Symbolica package warning: Using rat() heuristics for double-precision input (is this what you wanted?)|
|Date:||Fri, 17 Feb 2017 14:14:33 -0500|
On 17/02/17 08:18, Doug Stewart wrote:Good idea! I can help edit.
I am thinking of putting this on the wiki.
But first, the essential pattern here is:
1. Do a symbolic calculation (in this case, a derivative)
2. Evaluate that result for double values.
"subs" is not really the right tool for this. It makes symbolic substitutions.
Perhaps the right pattern here is:
>> df = diff(...)
>> dfh = function_handle(df)
Here "dfh" is a regular plain-old Octave anonymous function, can be evaluated efficiently for doubles, etc.
Note: you can also write this as "dfh = matlabFunction(df)" for compatibility with the Matlab Symbolic Toolbox.
There is some discussion about all this in https://github.com/cbm755/octs
|[Prev in Thread]||Current Thread||[Next in Thread]|