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engineeringNotation.mws

Presenting Scientific and Engineering Notation

by Otto Wilke
otto_wilke@hotmail.com

Some people, especially megawatt and microamp people, like to see numbers in engineering notation.  The following code presents real numbers in scientific notation and in engineering notation.

>    restart;
x:=98790;
xf:=evalf(x);
absxf:=abs(xf);
xlog:=log[10](absxf);
xfloor:=floor(xlog);
xmod:=modp(xfloor,3);

x := 98790

xf := 98790.

absxf := 98790.

xlog := 4.994712985

xfloor := 4

xmod := 1

>    [xf*10^(-xfloor)]*[10]^[xfloor];

[9.879000000]*[10]^[4]

>    [xf*10^(-xfloor+xmod)]*[10]^[xfloor-xmod];

[98.79000000]*[10]^[3]

>    restart;
x:=-.000354;
xf:=evalf(x);
absxf:=abs(xf);
xlog:=log[10](absxf);
xfloor:=floor(xlog);
xmod:=modp(xfloor,3);
[xf*10^(-xfloor)]*[10]^[xfloor];
[xf*10^(-xfloor+xmod)]*[10]^[xfloor-xmod];

x := -.354e-3

xf := -.354e-3

absxf := .354e-3

xlog := -3.450996738

xfloor := -4

xmod := 2

[-3.540000]*[10]^[-4]

[-354.000000]*[10]^[-6]

>    restart;x:=-1;
xf:=evalf(x);
absxf:=abs(xf);
xlog:=log[10](absxf);
xfloor:=floor(xlog);
xmod:=modp(xfloor,3);
[xf*10^(-xfloor)]*[10]^[xfloor];
[xf*10^(-xfloor+xmod)]*[10]^[xfloor-xmod];

x := -1

xf := -1.

absxf := 1.

xlog := 0.

xfloor := 0

xmod := 0

[-1.]*[10]^[0]

[-1.]*[10]^[0]

>