a) Consider the following file called coords.txt: x1 y1 x2 y2 0.0 0.0 0.4 1.0 0.
ID: 3890897 • Letter: A
Question
a) Consider the following file called coords.txt:
x1 y1 x2 y2
0.0 0.0 0.4 1.0
0.5 0.1 -0.25 0.9
0.75 0.4 -2.5 2.2
1.0 1.3 -1.0 4.2
Each field in this file is separated by a tab and each record is separated by a newline character. gawk is a very powerful utility; it can make calculations as well as support branching statements and function calls. Now write a one-line gawk script that computes the distance between each pair of points using the given tutorial above as a guide. Hint: gawk supports the sqrt function! Obviously, you need to skip the first line (i.e., the header) and only print out four values, the first of which is 1.07703.
b) Consider the following file called elems.txt:
1,H,Hydrogen
2,He,Helium
3,Li,Lithium
4,Be,Beryllium
. . .
115,Mc,Moscovium
116,Lv,Livermorium
117,Ts,Tennessine
118,Og,Oganesson
Since the shown file is incomplete, the elems.txt file is provided with this assignment. This file contains a list of the elements in the periodic table. Each field in this file is separated by a comma and each record is separated by a newline character. First, write a one-line gawk script that prints out just the record number and the element symbol (e.g., He) of all the elements in the list that contain the pattern "ium", without the quotes. Then, write another one-line gawk script that prints just the total number of lines that contain the pattern "ium”, without the quotes.
Explanation / Answer
a.awk 'NR>1 { print sqrt(($1-$3)^2 + ($2-$4)^2); }' a.txt
b. i)awk 'BEGIN{FS=","} /ium/ { print $1,$2 }' b.txt
ii)awk 'BEGIN{a=0} /ium/ {a++;} END { print a }' b.txt
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