How to use functions such as trunc and sgn in Geometry Sketchpad

Geometry Sketchpad is a powerful geometric drawing tool that provides a rich function library that contains functions for processing numbers and geometric objects. This article will focus on the use of the two functions trunc and sgn to help you expand the scope of use of the geometric sketchpad. The trunc function is used to truncate the decimal part and retain the integer part; the sgn function is used to determine the sign of the number. These two functions are very useful in geometric drawing. They can be used to calculate integers, extract symbols of geometric objects, and expand the application scenarios of Geometric Sketchpad. Next, this article will introduce the usage and application examples of these two functions in detail to help you gain an in-depth understanding of the function library of the Geometric Sketchpad and achieve more complex geometric drawings.

Open the geometric sketchpad, create a new coordinate system, draw any point A on the x-axis, and measure the abscissa of point A.

Select the [Data]-[Calculation] command, select the [Function]-[trunc] command in the pop-up [New Calculation] dialog box, and then click with the mouse pointer The measurement value of the abscissa coordinate of point A obtained in the previous step, and finally press [OK] to close the [New Calculation] dialog box to get the value of trunc(xA).

In the same way, the values ​​of round(xA) and sgn(xA) can be obtained.

Drag point A, observe the changes in the values ​​of xA, trunc(xA), round(xA) and sgn(xA), and understand the meaning of each function.

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