how to go back on previous line with printf

[pauljoseph]

Hi,
Is there anyway we can move the cursor back to the previous line using printf? For example if I do

printf('test line 1.\n');

The \n will change to the next line. May I know what character I can use to go back to the "test line 1." and put the cursor back after the dot?

Thanks.

[Jaroslav Hajek-2]

On Mon, Sep 1, 2008 at 8:52 AM, pauljoseph <oka.kurniawan@...> wrote:

>
> Hi,
> Is there anyway we can move the cursor back to the previous line using
> printf? For example if I do
>
> printf('test line 1.\n');
>
> The \n will change to the next line. May I know what character I can use to
> go back to the "test line 1." and put the cursor back after the dot?
>

AFAIK this is not possible using standard console output. For
instance, the output may be redirected to a printer, and you simply
can't go back. If your terminal supports ANSI escape sequences (most
of them do), then you can use them to accomplish this.
If you are trying to do something like progress reporting, then it's
better to not print the linefeed \n until done.

cheers

> Thanks.
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--
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz
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[Dave.Haddon]

On Sun, 2008-08-31 at 23:52 -0700, pauljoseph wrote:

> Hi,
> Is there anyway we can move the cursor back to the previous line using
> printf? For example if I do
>
> printf('test line 1.\n');
>
> The \n will change to the next line. May I know what character I can use to
> go back to the "test line 1." and put the cursor back after the dot?
>
> Thanks.

If you use '\r' that will take you to the beginning of the line.


for i = 1:10
    printf("Line %d of 10 \r",i)
endfor

This will print the message on the same line in a standard Octave shell.
When testing it, I found that it doesn't work under the QtOctave
though...  QtOctave does make some changes though.

I hope this helps.

David
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