== <number> ==

A number object represents a real value with an optional system of units:

[[rpimage(zoo_number1.gif)]]
{{{
  <number id="temperature">
    <about>
      <label>Ambient temperature</label>
      <description>This is the temperature in the environment around the device.</description>
    </about>
    <uq>false</uq>
    <units>K</units>
    <min>50K</min>
    <max>1000K</max>
    <default>300K</default>
    <preset>
      <value>300K</value>
      <label>300K (room temperature)</label>
    </preset>
    <preset>
      <value>77K</value>
      <label>77K (liquid nitrogen)</label>
    </preset>
  </number>
}}}
The {{{<preset>}}} values appear in a drop-down menu controlled by the little triangle button to the right of the number.

The {{{<uq>}}} attribute indicates if the number entry should have an Uncertainty Quantification icon next to it.  This value
overrides any system-level default, or tool-level setting in {{{<run><tool>}}}.

[[BR]]
[[rpimage(zoo_number2.gif)]]
{{{
  <number id="vsweep">
    <about>
      <label>Voltage Sweep +/-</label>
      <description>This determines the voltage sweep used to obtain results from the model.</description>
      <icon>
R0lGODlhGgASAKEBAAAAAP///////////yH+FUNyZWF0ZWQgd2l0aCBUaGUgR0lNUAAh+QQBCgAB
ACwAAAAAGgASAAACLoyPqcvtD8CRj8VZrYw8h/tRn2eA4Eiaosa1qttC1EmW81qrtbYvdG8DCodE
RQEAOw==
      </icon>
    </about>
    <units>V</units>
    <min>0V</min>
    <max>10V</max>
    <default>4V</default>
    <color>purple</color>
  </number>
}}}
The {{{<icon>}}} entry is a base64-encoded GIF file.  On Linux systems, use the {{{mimencode}}} program to create this text representation for the GIF image.

You can see working code in the [browser:trunk/examples/zoo zoo of examples] in the [browser:trunk/examples/zoo/number number example] or on the hub in the directory /apps/rappture/examples/zoo/number.