gnuplot

[UnknownBlue]

Hi.
I am trying to plot a 3D graph using gnuplot through visual C++ using *.bin file with 12 columns, in which only the 1st, 6th and 8th column is used as x,y,z axis to plot the 3D graph.
My first question is that must I rewrite the file into 3 columns for the gnuplot or can I use the original file (12 columns) to plot the graph? If the latter can be used, what are the codes that I must use to use the 1st, 6th and 8th column?
My second question, is there a need to define a space for the graph like a picture control or will the graph be shown as per normal like when running gnuplot itself?
My last question, how do I call gnuplot after opening the *.bin file?
Thanks in advance!

[AdrianH]

Hi.
I am trying to plot a 3D graph using gnuplot through visual C++ using *.bin file with 12 columns, in which only the 1st, 6th and 8th column is used as x,y,z axis to plot the 3D graph.
My first question is that must I rewrite the file into 3 columns for the gnuplot or can I use the original file (12 columns) to plot the graph? If the latter can be used, what are the codes that I must use to use the 1st, 6th and 8th column?
My second question, is there a need to define a space for the graph like a picture control or will the graph be shown as per normal like when running gnuplot itself?
My last question, how do I call gnuplot after opening the *.bin file?
Thanks in advance!

Looking quickly at the documentation, it looks like you may be able to do what you are asking without rewriting the file:

BINARY DATA FILES:

Gnuplot can read binary data files. However, adequate information
about details of the file format must be given on the command line or
extracted from the file itself for a supported binary `filetype`. In
particular, there are two structures for binary files, a matrix binary
format and a general binary format.

The matrix binary format contains a two dimensional array of 32 bit
IEEE float values with an additional column and row of coordinate
values. As with ASCII matrix, in the using list, repetition of the
coordinate row constitutes column 1, repetition of the coordinate
column constitutes column 2, and the array of values constitutes column
3.

The general binary format contains an arbitrary number of columns
for which information must be specified at the command line. For
example, `array`, `record`, `format` and *Note using:: can indicate the
size, format and dimension of data. There are a variety of useful
commands for skipping file headers and changing endianess. There are a
set of commands for positioning and translating data since often
coordinates are not part of the file when uniform sampling is inherent
in the data. Different from matrix binary or ASCII, general binary
does not treat the generated columns as 1, 2 or 3 in the using list.
Rather, column 1 begins with column 1 of the file, or as specified in
the `format` list.

There are global default settings for the various binary options
which may be set using the same syntax as the options when used as part
of the `(s)plot <filename> binary ...` command. This syntax is `set
datafile binary ...`. The general rule is that common command-line
specified parameters override file-extracted parameters which override
default parameters.

Matrix binary is the default binary format when no keywords specific
to general binary are given, i.e., `array`, `record`, `format`,
`filetype`.

General binary data can be entered at the command line via the
special file name '-'. However, this is intended for use through a
pipe where programs can exchange binary data, not for keyboards. There
is no "end of record" character for binary data. Gnuplot continues
reading from a pipe until it has read the number of points declared in
the `array` qualifier.

See `datafile binary` for more details.

As for the syntax, see "binary general" in the info page.

As for the last two questions, I'll have to answer that later, I have to go.


Adrian

[AdrianH]

Hi.
My second question, is there a need to define a space for the graph like a picture control or will the graph be shown as per normal like when running gnuplot itself?

I'm not sure what you are asking here.

My last question, how do I call gnuplot after opening the *.bin file?

Why are you opening the *.bin file for?


Adrian