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    <p>Andrew: I see no reason to make gnuplot handle those extra bytes before/after your data. Either Fortran does not do this padding, or it does and gnuplot handles it without a hassle. </p> <p>I've had a similar problem, and Google searches always brought me back here. I figured I'd better post my solution in case the same happens to other people. </p> <p>I've been trying to make a 2D colormap plot using gnuplot's "plot 'file.dat' matrix with image" command. My ASCII output files were too big, so I wanted to use binary files instead. What I did was something like the following: </p> <p>in fortran:</p> <pre><code>implicit none real, dimension(128,128) :: array integer :: irec ! ... initialize array ... inquire( iolength=irec ) array open( 36, 'out.dat', form='unformatted', access='direct', recl=irec ) write( 36, rec=1 ) array close( 36, status='keep' ) </code></pre> <p>in gnuplot: </p> <pre><code>plot 'out.dat' binary array=128x128 format="%float" with image </code></pre> <p>Notes: </p> <ul> <li><p>By default, gnuplot assumes single precision in binary files. If your fortran program outputs in double precision, simply change "%float" to "%double". </p></li> <li><p>My program used double precision data in the array, but output files were too big. Since images based on double or single precision are indistinguishable to the eye, and double-precision data files are large, I converted my double-precision data to single-precision data before writing it to a file. </p></li> <li><p>You may have to adapt the gnuplot command depending on what you want to do with the matrix, but this loads it in and plots it well. This did what I needed it to do, and I hope it helps anyone<br> else who has a similar problem. </p></li> <li><p>As you can see, if Fortran adds extra bytes before/after your data, gnuplot seems to read in the data without making you take those extra bytes into account. </p></li> </ul>
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