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Is it possible to conveniently direct the output of consecutive Print statements to the same output without actually accumulating the output in a temporary string/variable?

This would be useful in cases where there are a lot of small outputs say like in the example below:

For[i=1,i<=1000,i++,
Print[i," "];
]

By default each of the Print statements produces a new output cell, which is not desirable. I would prefer a C-style dump-to-terminal output, where one just prints i with a space.

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2 Answers 2

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For[i = 1, i <= 10, i++, WriteString["stdout", i, " "];]
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  • $\begingroup$ What is the easiest way to get the the output to line wrap to window width? $\endgroup$
    – Mr.Wizard
    Aug 20, 2013 at 18:47
  • $\begingroup$ Simple and clean. Exactly What I was looking for! $\endgroup$
    – my account_ram
    Aug 21, 2013 at 7:57
  • $\begingroup$ @Mr.Wizard You could either change the Stylesheet or, the hard way, do: For[i=1, If[i===1,(CurrentValue[#,PageWidth]=WindowWidth)&/@Cells[CellStyle->"Print"]]; i<=1000,i++,WriteString["stdout",i," "];] $\endgroup$
    – Rolf Mertig
    Aug 21, 2013 at 18:42
  • $\begingroup$ Well I don't have Cells in v7. How would I use the style sheets? Could it be done without affecting anything else (only the custom print function)? $\endgroup$
    – Mr.Wizard
    Aug 21, 2013 at 18:45
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    $\begingroup$ You have to change the Print style: set PageWidth->WindowWidth. I forgot how to do this at the notebook level. But you could create a custom stylesheet I guess. I gave up on style sheets a long time ago and just use the default one. $\endgroup$
    – Rolf Mertig
    Aug 21, 2013 at 18:48
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I would manipulate the front end as the code is being run from the front end

For[i = 1, i <= 1000, i++, Print[i, " "];];
SelectionMove[EvaluationCell[], Next, CellGroup];
FrontEndExecute[FrontEndToken["CellMerge"]]

Try the above code. I am at a loss as to what you will do next with the merged cell.

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    $\begingroup$ This can simplified a hair by replacing FrontEndExecute[FrontEndToken["CellMerge"]] with FrontEndTokenExecute["CellMerge"]. $\endgroup$
    – m_goldberg
    Aug 20, 2013 at 23:32
  • $\begingroup$ @Hans : I have a long-running calculation on a comp which is "unstable" - So i need it to save the outputs peridodically (AutoSave -> True) and want the output to be as compact as possible (which is why I did not want the newline to be automatically added). Thanks for your solution. I could use it in some other case! :) $\endgroup$
    – my account_ram
    Aug 21, 2013 at 7:58

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