# IBM Visualization Data Explorer User's Reference

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### System

Category

Debugging

Function

Executes a system function.

Syntax

    System(string);

Inputs

Name | Type | Default | Description
--- | --- | --- | ---
`string` | string | none | shell command to be executed

Functional Details

The System module uses the C library `system()` function to execute operating system commands.

If the characters %, \, or " occur in the command string, they must be escaped: the percent sign must be preceded by another percent sign; backslashes and double quotes must be preceded by a backslash.

Script Language Example

This example creates a sequence of captioned images using different isosurface values. The Format module creates a different image file name for each image. The System module executes the compress function to minimize the amount of disk space used.

    electrondensity = Import("/usr/local/dx/samples/data/watermolecule");
    electrondensity = Partition(electrondensity);
    camera = AutoCamera(electrondensity,resolution=300,aspect=1,width=2.5);
    macro makeiso(isoval)
    {
        isosurface = Isosurface(electrondensity, isoval);
        caption = Format("isoval = %g", isoval);
        caption = Caption(caption);
        imagename = Format("iso%4.2f.rgb", isoval);
        collected = Collect(caption, isosurface);
        image = Render(collected, camera);
        Display(image);
        WriteImage(image, imagename);
        command = Format("compress %s", imagename);
        System(command);
    }
    makeiso(0.1);
    makeiso(0.2);
    makeiso(0.3);
    makeiso(0.33);
    makeiso(0.36);
    makeiso(0.39);

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