can someone please help me with this code, I have this but it not able

to execute. can you tell what is not right or any suggestions?....Thanks

here's the initial question:

Write a statistical program in Ruby to:

a) Input the name of a data file from the command line arguments.

b) Input floating-point numbers from the data file.

c) Calculate and output the mean. This is the average, or the sum of

the

values divided by the number of values.

d) Calculate and output the median. This is the value such than half

the

values are larger and half are smaller. If you have an even number

of

values use either middle value or the average of the two middle

values.

code:

puts "This program was created by Thierry NY

puts "Project 5, November 10th 2010."

puts "Program description: This is a statistical program to calculate

floating-\

point numbers and output their mean and median.

nums = []

if ARGV[0] == nil

print "no argument detected, please enter filename."

filename = gets.to_s.chomp

else

filename = ARGV[0]

end

f = open filename, "r"

while x = f.gets

nums << x.to_f

end

f.close

nums = nums.sort

count = nums.size -1

mean = 0

until count == -1

mean = mean + nums[count]

count = count -1

end

mean = mean/nums.size.to_f

if nums.size%2! = 0

midindex = (nums.size-1)/2

median = nums [midindex]

else

midindex1 = (nums.size-1)/2

midindex2 = (nums.size)/2

median = (nums[midindex1] + nums[midindex2])/

end

puts "The mean is: # {mean}"

puts "The median is: # {median}"

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