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Re: making a Module or Column that will print lines interspersed with plots

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  • Subject: [mg129687] Re: making a Module or Column that will print lines interspersed with plots
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Mon, 4 Feb 2013 01:20:37 -0500 (EST)
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For the record, a semi-colon does _not_ in itself suppress output. 
Rather, a semi-colon separates the constituent expressions of a compound 
expression. When, however, there is a terminal semi-colon, the compound 
expression is treated as if there were a Null after that semi-colon. And 
Null returns no output. Hence the behavior is _as if_ the terminal 
semi-colon suppresses the output of the preceding expression.

On Feb 3, 2013, at 8:24 PM, Murray Eisenberg <murray at math.umass.edu> wrote:

> 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"];
>                    Print[plota];
>                    Print["something else"];
>                    Print[plotb]
>                  ]
>
> (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 <bwshore at me.com> 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
>> bwshore at me.com
>> (925) 455 0627
>> --------------------------
>>
>>
>>
>
> ---
> Murray Eisenberg                                    
murray at math.umass.edu
> 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
>
>
>
>
>

---
Murray Eisenberg                                    
murray at math.umass.edu
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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