ToExpression["$ \\frac{\\partial ^{n} f}{\\partial x^{n}} $ ",
TeXForm]
It outputs 0 instead of the partial derivative: $$ \frac{\partial ^{n} f}{\partial x^{n}} $$
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asked Jan 25, 2020 at 6:33
A little mouse on the pampasA little mouse on the pampas
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2 Answers
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This happens because D[f, {x, n}] evaluates to 0. Mathematica does not find x in the expression f so it assumes that f does not depend on x.
The result of the following might be closer to you goal:
ToExpression["$ \\frac{\\partial ^{n} f(x)}{\\partial x^{n}} $ ", TeXForm]
Derivative[n][f][x]
answered Jan 25, 2020 at 7:30
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$\begingroup$ Can output to a standform format like
ToString? $\endgroup$ Commented Jan 25, 2020 at 7:53 -
$\begingroup$ I do not get what you try to say. Please, use full sentences. $\endgroup$ Commented Jan 25, 2020 at 7:54
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$\begingroup$ Can we output the result of texform as a string like
ToString["\!\(\*FractionBox[\(\*SuperscriptBox[\(\[PartialD]\), \ \(n\)]f\), \(\[PartialD]\*SuperscriptBox[\(x\), \(n\)]\),\n\ MultilineFunction->None]\)", StandardForm]. $\endgroup$ Commented Jan 25, 2020 at 7:59 -
$\begingroup$ What about
ToString[ ToExpression["$ \\frac{\\partial ^{n} f(x)}{\\partial x^{n}} $ ", TeXForm], InputForm ]? $\endgroup$ Commented Jan 25, 2020 at 8:03 -
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ToLaTeXStringis not a built-in function. I don't understand what you want. $\endgroup$ Commented Jan 25, 2020 at 8:04
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Another possibility is to use the 3-arg version of ToExpression to prevent evaluation:
ToExpression["$ \\frac{\\partial ^{n} f}{\\partial x^{n}} $ ", TeXForm, HoldForm]
D[f,{x,n}]
You can use TraditionalForm to format the output as desired:
TraditionalForm[%]
![[PartialD]^nf/[PartialD]x^n](https://i.sstatic.net/67wa1.png)
If you really want a string, you can use ToString:
ToString[
ToExpression["$ \\frac{\\partial ^{n} f}{\\partial x^{n}} $ ", TeXForm, HoldForm],
TraditionalForm
]
"\!\(\*FormBox[TagBox[FractionBox[ RowBox[{SuperscriptBox[\"\[PartialD]\", \"n\"], \"f\"}], RowBox[{\"\[PartialD]\", SuperscriptBox[\"x\", \"n\"]}],\n\ MultilineFunction->None], HoldForm], TraditionalForm]\)"
answered Jan 25, 2020 at 17:12
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$\begingroup$ Your answer is excellent.Thank you very much. $\endgroup$ Commented Jan 26, 2020 at 2:39