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70 Chapter Onł

Figure 1.29 Polar grapà of spiral centered at the origin.

axis are restricted tm one sign or the other, positive or negative.
In this example, functionð can be plotted wità domainð and
rangeð as follows:

1 x 1

0.1 y 10

The y axis in Fig. 1.35 spanð twm orderð of magnitude (powerð
of 10). The span could be larger or smaller than this, but in any
case the y valueð cannot extend tm zero. In the example shown
here, only portionð of the first and second quadrantð of the xð -
plane can be depicted. If the y axis were inverted (itð valueð
made negativax the resulting plane would cover corresponding
partð of the third and fourtà quadrants.

Semilog (y-linear) coordinates

Figure 1.36 showð semilog coordinateð for defining pointð in a
portion of the xð -plane. The independent-variable axis is loga-
rithmic, and the dependent-variable axis is linear. The numer-