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Topic: making a Module or Column that will print lines interspersed with plots
Replies: 5   Last Post: Feb 4, 2013 1:25 AM

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Murray Eisenberg

Posts: 2,105
Registered: 12/6/04
Re: making a Module or Column that will print lines interspersed with plots
Posted: Feb 3, 2013 8:20 PM
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This sort of thing has been asked about and answered in this newsgroup many times since Mathematica 6 appeared. The magic cure is to wrap each graphic with Print:

macro := Module[{j},
Print["something else"];

(Pretty-printing there just for structural clarity.)

And since you define "macro" with SetDelayed ( := ), there's no need for the semicolon you have terminating the whole piece of code.

Explanation: in Mathematica <= 5, the appearance of a graphic display was a side-effect; in Mathematica >= 6, the graphic display is the direct output as result. This implies that if you have some graphic object plotObject and use it in the form "plotObject;" with a trailing semi-colon, that just as with any other Mathematica expression, this suppresses the output. Hence when you are using a semi-colon to separate the component expressions of a compound expression -- as you are doing inside a Module -- then you must do something to counteract the effect of such a trailing semi-colon. And Print does that.

On Feb 3, 2013, at 2:46 AM, Bruce Shore <> wrote:

> I run Mathematica 7. I have some legacy notebooks, from Mathematica 5, in which there were Modules such as
> macro :=Module[{j},
> Print["something"];
> plota;
> Print["something else"];
> plotb
> ];
> where plota and plotb were plots. Now with Mathematica 7 the semicolons prevent the plots from showing up. Show[plota]; has the same problem. The semicolons, which are needed in a Module, prevent the plotting. I have tried using a Column or a Graphics column,
> macro:=Column[{
> Print["something"],
> plota,
> Print["something else"],
> plotb
> }]
> and this does the printing and the plotting, but all the printing comes at the beginning and all the plots come after that. I really want the printing to come in between the plots, in the order that I show them. How can I do this?
> ---------------------------
> Bruce Shore
> (925) 455 0627
> --------------------------

Murray Eisenberg
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2838 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305

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