5.8.2 The standard infixed operators on real numbers: + - * / ^
The +, -, *, /, and ^
operators are the usual infixed operators to do addition, subtraction,
multiplication, division and raising to a power.
Examples
- Input:
3+2
Output:
- Input:
3-2
Output:
- Input:
3*2
Output:
- Input:
3/2
Output:
- Input:
3.2/2.1
Output:
- Input:
3^2
Output:
- Input:
3.2^2.1
Output:
Remark.
You can use the square key or the cube key if your keyboard has one;
for example: 32 returns 9.
Remarks on non integral powers.
If x is not an integer, then ax=exp(x ln(a)), hence if x
is not rational, then ax is well-defined only for a>0. If x is
rational and a<0, the principal branch of the logarithm is used,
leading to a complex number. Note the difference between
(a)1/n and a1/n when n is an odd integer.
Example
To draw the graph of y=∛x3−x2:
Input:
plotfunc(ifte(x>0,(x^3-x^2)^(1/3), |
-(x^2-x^3)^(1/3)),x,xstep=0.01)
|
You might also input:
plotimplicit(y^3=x^3-x^2)
but this is much slower and much less accurate.