Basic example 1

How to create a simple plot using default settings

This is an introductory example that shows how to create a simple plot using NCL, HLU C, or HLU FORTRAN library calls. This module discusses the minimal set of steps needed to produce an NCAR Graphics plot using mostly default settings. The names of the source code files that create this plot are basic01n.ncl, basic01c.c, and basic01f.f.

Discussion

This example creates a contour plot object using the minimum number of steps needed to create a plot. This example does not use any data, however, and is therefore most useful for instruction rather than for creating graphical output.

This example creates a single output frame in an X Window. The example shows how to choose the type of graphic output, how to create a contour plot object (with no data), how to draw the plot, how to update and clear the workstation with the frame call, and how to clean up memory after you are finished. A detailed discussion about how to create the plot is discussed in the comments of the source codes for the example.

Creating the plot using HLU C library calls

A discussion of how to create the plot using an HLU C program is located in the source code file basic01c.c.

Creating the plot using HLU FORTRAN library calls

A discussion of how to create the plot using an HLU FORTRAN program is located in the source code file basic01f.f.

Creating the plot using NCL

A discussion of how to create the plot using an NCL script is located in the script file basic01n.ncl.

The data

No data is used in this plot.

How to run this example

There are three ways to produce this example: by using an NCL script (basic01n.ncl), a C program (basic01c.c), or a FORTRAN program (basic01f.f). The examples are installed in the following locations:

You can copy this example and run it by typing "ng4ex basic01n", "ng4ex basic01c", or "ng4ex basic01f". A copy of the source file will be placed in your current working directory. The source code will be compiled (if appropriate) and automatically run for you. The image will display to an X Window on your workstation.

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$Revision: 1.9 $ $Date: 1999/03/23 18:28:09 $