Let's do simple calculations | Introduction to Rstats (statistical analysis/scientific calculation) - Perl ABC - Perl Installation, Perl Tutorial, Many Examples

Let's do simple calculations | Introduction to Rstats (statistical analysis/scientific calculation)

Let's do a simple calculation. Rstats can be calculated using the following operators.

Four arithmetic operations

symbol	meaning
+	addition
- -	subtraction
*	multiplication
/	division

The symbols for addition, subtraction, multiplication, and division are the same as in R language.

Exponentiation

Exponentiation is done using "**" according to Perl's arithmetic rules. Please note that it is different from "^" in R language.

symbol	meaning
	Exponentiation

Remaining

The remainder is done using "%" according to Perl's arithmetic rules. Please note that it is different from "%%" in R language.

symbol	meaning
%%	Surplus

Integer quotient

Rstats does not provide operators for calculating integer quotients. Please note that the R language "% /%" is not available. To find the integer quotient, use the trunc function. After performing the division, the integer part is taken out.

r->trunc($x1/$x2)

Here is an example of the calculation. In Rstats, the calculation using vectors is the basis, so we will create it using the c_ function. The c_ function is a function for creating a vector. Even if it is one numerical value, it is calculated as a vector with one element.

use strict;
use warnings;
use Rstats;

my $x = (c_ (1) + c_ (2) - c_ (3) * c_ (4))/c_ (5) ** c_ (6);
print $x;

This is the output result. The calculation result is output.

[1] -0.000576

Using c_ () at any time can be a bit annoying, but it's necessary because you're implementing the R language on top of Perl. Remember that when you do calculations in Rstats, you always use vectors to do the calculations.

For future examples, I will write from the line under "use Rstats " above for convenience, so please supplement if necessary.

Rstats provides many functions for route calculation and logarithmic calculation. For example, to calculate the route, use the "sqrt function".

my $x = r->sqrt(c_ (2));
print $x;

Output result.

[1] 1.4142135623731

The mathematical functions provided by Rstats are introduced below.

symbol	meaning
sqrt	Calculation of √
abs	Absolute value
exp exp	The bottom of the natural logarithm
expm1	Calculate exp(x) -1 more accurately when the absolute value of x is much less than 1
log	Natural logarithm
log10	Common logarithm (base 10 logarithm)
log2	Logarithm with base 2
sin	Sine/sine function
cos	Cosine/cosine function
tan	Tangent tangent function
asin	Inverse function of sin
acos	Inverse function of cos
atan	Inverse function of tan
sinh	Hyperbolic sign
cosh	Hyperbolic cosine
tanh	Hyperbolic tangent
asinh	Inverse function of sinh
acosh	Inverse function of cosh
atanh	Inverse function of tanh
logb	Same as log
log1px (not implemented)	Calculate log(1 + x) more accurately when the absolute value of x is (much) less than 1
gamma (not implemented)	Gamma function
lgamma (not implemented)	Same as log(gamma (x))
ceiling	Minimum integer greater than or equal to the argument
floor	Maximum integer less than or equal to the argument: the so-called Gaussian symbol
trunc	Find the integer part
round	Rounding
signif (x, a) not implemented yet	Round x to a digit with a valid digit (unlike sign that determines positive/0/negative)

Introduction to Rstats (statistical analysis/scientific calculation)

Perl ABC