I assume your divergence operator is custom defined by yourself (or else please point me where I can find it in Mathcad). Then it is defined as a variable...
Mathcad provides little to no control on the sequence of variables in the output of symbolic evaluation.
You might get by, when you use the divergence operator as an operator (i.e. as a function). I tried this in Mathcad 11 (with the operator/function 'div' undefined ! 😞
Success!
Luc
What 'lower placeholder' are you referring to?
I used the ' x f ' out of:
to build the LHS of my second equation. But you can see what the symbolic processor returns as output.
In any case, this is mathematically correct.
I still think you used the divergence symbol (only) as a variable, am I right?
Incidentally, where did you find the divergence symbol?
I refer to this:
They have impressed me these results:
I have to check the accuracy of the results.
You are right, that you can omit/delete the placholder for the variable in the gradient operator. But it seems that you deleted the placeholder for the function, too, and so you end up as Richard already stated with a simple variable. You see the multiplication dot between the nabla-symbol and the variable D or B.
I am not sure what you expected the nabla-symbol to be. Mathcad obviously gives you the result you expected anyway as the order of the operands in a product does not matter.
If you know all what was written already I wonder, why you ask
You should also know that we have in general very few influence on the way Mupad presents its results and how it arranges its variables.
And the nabla symbol the way you used it is just a variable,, not an operator!
... I thought that, despite nabla was considered as a variable, the processor had not swapped the two variables in such a way that the equation formally was correct. As are formally correct the following:
I see - basically in great parts you are using Mathcad simply as an equation editor, so making nabla a variable does not harm if you connive at the (implicit or explicit) multiplication after the symbol. But when it comes to symbolic math, you run into troubles. While I doubt its a good idea making the nabla operator a varible, may the keyword "collect" helps.
Sometimes you are able to take influence on the outcome that way:
I think the closest you can get is to use the cross-product operator:
And I find the prefix notation result, with the nabla operator, intriguing.
Success
Luc
OK. the nabla symbol is not available in Mathcad 11, but,
using the undocumented symbolic functions Diff() and diff()
that produce respectively calculate (partial) derivatives of
the (assumed function) first parameter to the second parameter:
you can get this:
For those who can benefit from it.
