I'm learning shell scripting using bash and I want to generate 4 floating point number with 5 decimal places and write them to a file and a variable. I've done all this except the $RAMDOM enviroment variable does not generate a float number but a integrer.
I hope you could explain why to lead me to a solution.
Thnak you all in advance.
PS: script so far
Code:
#!/bin/bash
#: Title : randomFloats
#: Date : 2011-03-27
#: Author : pharaoh
#: Version : 1.0
#: Discription : Generate a 4 float numbers with 5 decimal places and write them to a file and a variable
listFloats=0.0
for i in $(seq 0 3)
do
aux=$[($RANDOM % 15000)]
printf -v aux "%.5f" ${aux}
#In the first iteration it just set the variable, in the others it append
if [ ${i} -eq 0 ]
then
listFloats=${aux}
printf ${aux} > randomFloats.txt
else
listFloats="${listFloats} ${aux}"
printf ${aux} >> randomFloats.txt
fi
done
printf "%s\n" ${listFloats}
how to add 2 float values to each other?
i tried this and it doesnt work:
#!bin/bash
numone=1.234
numtwo=0.124
total=`expr $numone + $numtwo`
echo $total
thanks (5 Replies)
Hi all,
I have doubt can array in a shell script can store floating point numbers. i have tired. but i unable to work it out.
Please help me regarding this
Thank U
Naree (1 Reply)
Hello All,
I want to make a simple script which generate random number from 0 to 1000.
and simply display it.
Plz HELP!!!!!!
Regards,
Waqas Ahmed (2 Replies)
Hi, i have a simple control like this:
if(sum>1.0)...
If i try to print sum i get 1.000000 but the check returns true. I think it depends on float precision. How can i modify the check?
thanks (1 Reply)
Hi,
I am having trouble with generating random numbers. can this be done with awk?
So I have a file that looks like this:
23 30
24 40
26 34
So column1 is start and column2 is end. I want to generate 3 random #'s between start and stop:
So the output will look like this:
... (9 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
Write a shell script that will take the sum of two random number?
Ex: Random n1 +Random n2 = result
i tries to write it but i had some dufficulties
... (3 Replies)
I am using bash
I have a script that takes a number, i.e. 85.152, which is always a non integer and essentially tries to get that number to be a multiple of 10. My code is as follows:
number=85.152
A=${number%.*} #Converts float to integer
typeset -i B=$(((A-20)/10)) #subtracting 20 is... (12 Replies)
Hi, I need to run a Fortran program which reads a input file with a fixed name many times, each time I need to change a number (real) in that input file, this is how I currently do it and I know it is not elegent at all:
cp inputfile.dat backup.dat
sed -i 's/28.0/0.01/g' inputfile.dat
./myCode... (3 Replies)
Discussion started by: dypang
3 Replies
LEARN ABOUT SUNOS
float
float.h(3HEAD) Headers float.h(3HEAD)NAME
float.h, float - floating types
SYNOPSIS
#include <float.h>
DESCRIPTION
The characteristics of floating types are defined in terms of a model that describes a representation of floating-point numbers and values
that provide information about an implementation's floating-point arithmetic.
The following parameters are used to define the model for each floating-point type:
s sign (+-1)
b base or radix of exponent representation (an integer >1)
e exponent (an integer between a minimum emin and a maximum emax)
p precision (the number of base-b digits in the significand)
fk non-negative integers less than b (the significand digits)
In addition to normalized floating-point numbers (f1>0 if x!=0), floating types might be able to contain other kinds of floating-point num-
bers, such as subnormal floating-point numbers (x!=0, e=emin, f1=0) and unnormalized floating-point numbers (x!=0, e=emin, f1=0), and val-
ues that are not floating-point numbers, such as infinities and NaNs. A NaN is an encoding signifying Not-a-Number. A quiet NaN propagates
through almost every arithmetic operation without raising a floating-point exception; a signaling NaN generally raises a floating-point
exception when occurring as an arithmetic operand.
The accuracy of the library functions in math.h(3HEAD) and complex.h(3HEAD) that return floating-point results is defined on the libm(3LIB)
manual page.
All integer values in the <float.h> header, except FLT_ROUNDS, are constant expressions suitable for use in #if preprocessing directives;
all floating values are constant expressions. All except DECIMAL_DIG, FLT_EVAL_METHOD, FLT_RADIX, and FLT_ROUNDS have separate names for
all three floating-point types. The floating-point model representation is provided for all values except FLT_EVAL_METHOD and FLT_ROUNDS.
The rounding mode for floating-point addition is characterized by the value of FLT_ROUNDS:
-1 Indeterminable.
0 Toward zero.
1 To nearest.
2 Toward positive infinity.
3 Toward negative infinity.
The values of operations with floating operands and values subject to the usual arithmetic conversions and of floating constants are evalu-
ated to a format whose range and precision might be greater than required by the type. The use of evaluation formats is characterized by
the architecture-dependent value of FLT_EVAL_METHOD:
-1 Indeterminable.
0 Evaluate all operations and constants just to the range and precision of the type.
1 Evaluate operations and constants of type float and double to the range and precision of the double type; evaluate long double
operations and constants to the range and precision of the long double type.
2 Evaluate all operations and constants to the range and precision of the long double type.
The values given in the following list are defined as constants.
o Radix of exponent representation, b.
FLT_RADIX
o Number of base-FLT_RADIX digits in the floating-point significand, p.
FLT_MANT_DIG
DBL_MANT_DIG
LDBL_MANT_DIG
o Number of decimal digits, n, such that any floating-point number in the widest supported floating type with pmax radix b digits can be
rounded to a floating-point number with n decimal digits and back again without change to the value.
DECIMAL_DIG
o Number of decimal digits, q, such that any floating-point number with q decimal digits can be rounded into a floating-point number
with p radix b digits and back again without change to the q decimal digits.
FLT_DIG
DBL_DIG
LDBL_DIG
o Minimum negative integer such that FLT_RADIX raised to that power minus 1 is a normalized floating-point number, emin.
FLT_MIN_EXP
DBL_MIN_EXP
LDBL_MIN_EXP
o Minimum negative integer such that 10 raised to that power is in the range of normalized floating-point numbers.
FLT_MIN_10_EXP
DBL_MIN_10_EXP
LDBL_MIN_10_EXP
o Maximum integer such that FLT_RADIX raised to that power minus 1 is a representable finite floating-point number, emax.
FLT_MAX_EXP
DBL_MAX_EXP
LDBL_MAX_EXP
o Maximum integer such that 10 raised to that power is in the range of representable finite floating-point numbers.
FLT_MAX_10_EXP
DBL_MAX_10_EXP
LDBL_MAX_10_EXP
The values given in the following list are defined as constant expressions with values that are greater than or equal to those shown:
o Maximum representable finite floating-point number.
FLT_MAX
DBL_MAX
LDBL_MAX
The values given in the following list are defined as constant expressions with implementation-defined (positive) values that are less than
or equal to those shown:
o The difference between 1 and the least value greater than 1 that is representable in the given floating-point type, b**1 - p.
FLT_EPSILON
DBL_EPSILON
LDBL_EPSILON
o Minimum normalized positive floating-point number, b**emin**-.
FLT_MIN
DBL_MIN
LDBL_MIN
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO complex.h(3HEAD), math.h(3HEAD), attributes(5), standards(5)SunOS 5.10 17 Dec 2003 float.h(3HEAD)
03-27-2011
