Quick Question;

If I have a string of numbers for example:

18.0 8 307.0 130.0 3504. 12.0 70 1

How would i convert each of these numbers to a double and put each one into a separate double array?

This post was edited by axumo0 on Nov 3 2014 03:10pm

if it is just a single string, break each number into tokens/substrs based on ws delim

then do like



(that is the JAVA function)

This post was edited by Eep on Nov 3 2014 03:23pm

Basically I'm doing this for a whole file. The numbers that correspond to each other go vertically that's why I need each one of these in a separate array. I can't get my program to read doubles from the text as I keep getting type mismatch exceptions but I can take it in as String and that seems to work but now I still need each number separately and in double form.

well, right.

That's why I said you need to split the BIG string by using something like a substring function to get each individual number you want as a string. It seems they are separated by whitespace, so that would be your delimiter.

This is one solution that I can think of off the top of my head.

This post was edited by Eep on Nov 3 2014 03:35pm

I think I got it what i did was,

String[] tokens = input.split("\\s+");
And then just add each value I need into an array

yep! using that Double.parseDouble(), it will convert your numeric strings into the double format.

Damn now i have another problem. it actually doesn't split properly it put its all into tokens[0] instead of each String at a separate index

hrm, that is weird.

Looking at SO, I see this example:



which seems to do what it should and is similar to yours

edit: maybe check your regex? you are doing

shouldn't it be



http://rubular.com/ pretty useful site for checking regex

This post was edited by Eep on Nov 3 2014 04:27pm

Can't do "\s+" says invalid escape sequence

Basically this is my first string

218.0 178.0 9 0.11111111 0.0 0.8333327 0.54772234 1.1111094 0.5443307 59.62963 52.444443 75.22222 51.22222 -21.555555 46.77778 -25.222221 75.22222 0.31899637 -2.0405545 6

I did this just by reading the first line of the file

This post was edited by axumo0 on Nov 3 2014 04:32pm

huh...

you are correct, after looking online, "\\s+" is the correct java convention.



Maybe post your input file?

I am heading to class and maybe someone else can help you finish it. String.split() should net you the proper array though if the regex worked for your input file, so I am not sure what you got everything at index 0.