Examples of Fortran Code
Re-written in IDL
Re-writing your fortran code in IDL is not difficult. The following
are examples of original Fortran code by a NIST researcher.
This is a program called align.f. Click
here for an IDL version of the same code called align.pro.
This example shows:
Declaring an array
Doing some simple math
Printing
Using a FOR loop
Plotting a graph to the monitor
The outputted graph looks like:
This example is based on the program plotber.f,
and was re-written as plotber.pro.
The data files are NPOINT and TRAJ.
This example shows:
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Opening a data file
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Reading variables from a data file
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Closing the data file
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Mulitdimensional arrays (for reading data columns)
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Plotting a graph
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Place an annotation within the graph
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Saving as a PostScript file
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Printing the PostScript output graph
This example is based on the program xy.f,
and was re-written as xy.pro. The data file
is example. This example shows the features
listed below, but a caveat should be given. The original program
which generated the data outputted the data to be able to use disspla.
That was a cumbersome way of doing things. IDL is much easier, but
this example is a little cumbersome because it is using the old format
(at least in part). Nonetheless, this example provides useful techniques.
Also included is a special function written to
plot both X and Y error bars. Note that Oploterr is a built-in
library function that plots points with Y error bars.
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Opening a data file
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Reading multiple variables from a data file
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Closing the data file
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Mulitdimensional arrays (for reading data columns)
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Plotting a graph
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Using different linestyles
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Plotting X & Y error bars
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Interactively asking whether you want to send to Tek window, print, or
save as a PostScript file
Because this plot uses an external function, you must compile it
first before compiling and executing the main code. An example of
the sequence of commands (at the IDL prompt) to do this would be:
.rnew xyoerr.pro
.rnew xy.pro
xy
