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Computer Language Benchmarks Game      [[ Play ]]

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 performance measurements

Each table row shows performance measurements for this Ruby 2.0 program with a particular command-line input value N.

N	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
500	3.34	3.34	6,136	292	1% 0% 0% 100%
3,000	116.10	116.13	6,144	292	0% 0% 0% 100%
5,500	394.71	394.79	6,396	292	0% 0% 0% 100%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read spectral-norm benchmark to see what this program should do.

 notes

ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]

 spectral-norm Ruby 2.0 program source code

# The Computer Language Benchmarks Game
# http://benchmarksgame.alioth.debian.org
# Contributed by Sokolov Yura

def eval_A(i,j)
	return 1.0/((i+j)*(i+j+1)/2+i+1)
end

def eval_A_times_u(u)
        v, i = nil, nil
	(0..u.length-1).collect { |i|
                v = 0
		for j in 0..u.length-1
			v += eval_A(i,j)*u[j]
                end
                v
        }
end

def eval_At_times_u(u)
	v, i = nil, nil
	(0..u.length-1).collect{|i|
                v = 0
		for j in 0..u.length-1
			v += eval_A(j,i)*u[j]
                end
                v
        }
end

def eval_AtA_times_u(u)
	return eval_At_times_u(eval_A_times_u(u))
end

n = ARGV[0].to_i
u=[1]*n
for i in 1..10
        v=eval_AtA_times_u(u)
        u=eval_AtA_times_u(v)
end
vBv=0
vv=0
for i in 0..n-1
        vBv += u[i]*v[i]
        vv += v[i]*v[i]
end
print "%0.9f" % (Math.sqrt(vBv/vv)), "\n"

 make, command-line, and program output logs

Mon, 25 Feb 2013 11:19:05 GMT

COMMAND LINE:
/usr/local/src/ruby-2.0.0-p0/ruby spectralnorm.yarv 5500

PROGRAM OUTPUT:
1.274224153

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