Generate points for cdf


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# 1  
Generate points for cdf

Hi,

I am trying to make a cdf curve from the following data.

Code:
34.3
19.2
20.7
28.3
32.5
21
37.6

The output should be something like this:

Code:
0         0
19.2    0.14
20.7    0.28
21       0.42
28.3    0.56
32.5    0.70
34.3    0.84
37.6    0.98

I plan to feed this points to gnuplot to plot it as a graph. I tried plotting the same data with smooth cumulative function in gnuplot, which seems to not return the exact graph that I want.

Your help is much appreciated.

Thanks.
# 2  
Code:
 $ sort file | awk 'BEGIN{print 0"\t"0;a=0.14}{ printf "%s\t%s\n", $1,a;a+=0.14}'

0       0
19.2    0.14
20.7    0.28
21      0.42
28.3    0.56
32.5    0.7
34.3    0.84
37.6    0.98

# 3  
Hi,

Thanks for the response. I ended up writing an entire script from scratch to do this dynamically. I think that the code that you have posted needs input for the 1/number_of_entries value each time.

Here is my solution..

Code:
#!/bin/bash

count=$(cat sorted1.txt | wc -l)

var=$(echo "1/$count" | bc -l)

holding=$(echo "1/$count" | bc -l)

echo 0  > cdf1.txt
echo 0  >> cdf1.txt
#echo $var

for i in $(eval echo {1..$count})
do
	echo $var >> cdf1.txt
	var=$(echo "$var+$holding" | bc -l)
done

# 4  
You might want to consider this alternative:
Code:
sort -n file | awk '
{	d[++c] = $0
}
END {	inc = 1 / c
	for(i = 0; i <= c; i++)
		printf("%.1f\t%.2f\n", d[i], i * inc)
}'

which produces the output:
Code:
0.0	0.00
19.2	0.14
20.7	0.29
21.0	0.43
28.3	0.57
32.5	0.71
34.3	0.86
37.6	1.00

from your sample input.

I know this isn't the output you said you wanted, but it seems to be better suited to what you're trying to do.
This User Gave Thanks to Don Cragun For This Post:
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