## Formatting quirk

General discussion about Mathematica features and functionality...
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### Formatting quirk

Hi folks:

I'm trying to make a Manipulate cell that shows some sigma notation in traditional form, and that has updating text above it.

Here is some code without the text. Everything looks just like I want it, with the exception of the missing text up top. It'd be nice to get the overscript "k" to change in the sigma notation, but no big deal:

_______

Manipulate[
Row[{HoldForm[Sum[(-1)^n/2^n, {n, 0, Style["k", Italic]}]], " = ",
Sum[(-1)^n/2^n, {n, 0, k}], " = ",
N[Sum[(-1)^n/2^n, {n, 0, k}], 20]}], {k, 1, 40, 1}]]
_________

Now, in the next code I've added a snippet of text above, and that screws up the display of the traditional form for some reason:
_________

Manipulate[
Column[{
Row[{"Adding up ", ToString[k], " terms:"}],
" ",
Row[{HoldForm[Sum[(-1)^n/2^n, {n, 0, Style["k", Italic]}]], " = ",
Sum[(-1)^n/2^n, {n, 0, k}], " = ",
N[Sum[(-1)^n/2^n, {n, 0, k}], 20]}]
}], {k, 1, 15, 1}]]
___________

Among other things, I have tried putting the Sigma notation in a Pane that is plenty tall enough to allow the full traditional form, and that didn't work.

Anyone have any good ideas about this? I've tried five or six different things to no avail.

Thanks,

Rob

Rob_Holman

Posts: 14
Joined: Wed Feb 29, 2012 7:03 pm
Organization: The Walker School
Department: Mathematics and Science

### Re: Formatting quirk

Hi Rob,

The Column command has a default setting that automatically shrinks the typesetting for things like Sum, Product, and Integrate. If we turn this behavior off, you'll get result you're looking for:

Manipulate[
Column[{Row[{"Adding up ", ToString[k], " terms:"}], " ",
Row[{HoldForm[Sum[(-1)^n/2^n, {n, 0, Style["k", Italic]}]], " = ",
Sum[(-1)^n/2^n, {n, 0, k}], " = ",
N[Sum[(-1)^n/2^n, {n, 0, k}], 20]}]},
AllowScriptLevelChange -> False], {k, 1, 15, 1}]]

Thanks,
Michael

Michael_Morrison

Posts: 42
Joined: Fri Sep 11, 2009 9:50 pm
Organization: Wolfram Research, Inc.