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added 10 characters in body

Source Link

edited Jun 17, 2014 at 15:28

9.5k
4
31
57

Perl - 122121 122

(+2 for -p)

s/(?<![-\d.*^])-?[\d.]+(?![*^\d.])/0/g;s/(?<!\^)x(?!\^)/1/g;s/x\^(-?[\d.]+)/$1.'*x^'"$1*x^".($1-1)/ge;s/([\d.]+)\^x/ln($1)*$&/g

Test:

$ perl -p diff.pl << EOF
> -3
> 8.5
> x^0.5
> x^-7
> 0.5^x
> 7^x
> 3*x^5
> -0.1*0.3^x
> -5*x^2+10-3^x
> EOF
0
0
0.5*x^-0.5
-7*x^-8
ln(0.5)*0.5^x
ln(7)*7^x
3*5*x^4
-0.1*ln(0.3)*0.3^x
-5*2*x^1+0-ln(3)*3^x

Perl - 122

(+2 for -p)

s/(?<![-\d.*^])-?[\d.]+(?![*^\d.])/0/g;s/(?<!\^)x(?!\^)/1/g;s/x\^(-?[\d.]+)/$1.'*x^'.($1-1)/ge;s/([\d.]+)\^x/ln($1)*$&/g

Test:

$ perl -p diff.pl << EOF
> -3
> 8.5
> x^0.5
> x^-7
> 0.5^x
> 7^x
> 3*x^5
> -0.1*0.3^x
> -5*x^2+10-3^x
> EOF
0
0
0.5*x^-0.5
-7*x^-8
ln(0.5)*0.5^x
ln(7)*7^x
3*5*x^4
-0.1*ln(0.3)*0.3^x
-5*2*x^1+0-ln(3)*3^x

Perl - 121 122

(+2 for -p)

s/(?<![-\d.*^])-?[\d.]+(?![*^\d.])/0/g;s/(?<!\^)x(?!\^)/1/g;s/x\^(-?[\d.]+)/"$1*x^".($1-1)/ge;s/([\d.]+)\^x/ln($1)*$&/g

Test:

$ perl -p diff.pl << EOF
> -3
> 8.5
> x^0.5
> x^-7
> 0.5^x
> 7^x
> 3*x^5
> -0.1*0.3^x
> -5*x^2+10-3^x
> EOF
0
0
0.5*x^-0.5
-7*x^-8
ln(0.5)*0.5^x
ln(7)*7^x
3*5*x^4
-0.1*ln(0.3)*0.3^x
-5*2*x^1+0-ln(3)*3^x

Source Link

created Jun 17, 2014 at 15:18

mniip

9.5k
4
31
57

Perl - 122

(+2 for -p)

s/(?<![-\d.*^])-?[\d.]+(?![*^\d.])/0/g;s/(?<!\^)x(?!\^)/1/g;s/x\^(-?[\d.]+)/$1.'*x^'.($1-1)/ge;s/([\d.]+)\^x/ln($1)*$&/g

Test:

$ perl -p diff.pl << EOF
> -3
> 8.5
> x^0.5
> x^-7
> 0.5^x
> 7^x
> 3*x^5
> -0.1*0.3^x
> -5*x^2+10-3^x
> EOF
0
0
0.5*x^-0.5
-7*x^-8
ln(0.5)*0.5^x
ln(7)*7^x
3*5*x^4
-0.1*ln(0.3)*0.3^x
-5*2*x^1+0-ln(3)*3^x