It's dead simple... I think you should all try it even if I lose you a little in the explanation... (or indeed have never programmed before!)
In the lab today (Java) someone asked me about MATLAB... (these are both programming languages). The question was...
I've got a vector full of zeros and ones - I want to make the zeros into ones and the ones into minus ones... how?
So there you are... how would you do it?
In English... he's got a list of numbers like this 0, 1, 0, 0, 1, 1.... and wants to make this into a list that's 1, -1, 1, 1, -1, -1...
Here's an example for you... go through each item in the list and if the number is 0 set it to 1 and if it's a 1 set it to a -1 - this way is kinda pants if you ask me)
As a hint... as MATLAB lets you do stuff to the whole vector at once... For example... say I've got my 0, 1, 0, 0, 1, 1 vector... and I want to add five to all of the numbers I'd do something like y=x+5 - which would give me 5, 6, 5, 5, 6, 6 (with x being the original vector and the result being put in y...
So... how would you do it? (There's probably no wrong answer)
How about y=-2x+1
That would seem to work.
How did you do it?
Posted by: Tom on March 10, 2007 11:41 AMJust like you did :-)
Posted by: Ed on March 10, 2007 2:00 PMWoo, that's the same solution I came up with. Can we have a more difficult one now :)
Posted by: Chris on March 11, 2007 9:28 AMWell seeing as you asked... here's one I had to come up with in part of my PhD...
I've got a vector full of signed numbers (ie +ve or -ve)...
If it's a -ve number I want there to be a 2 in it's place and if it's +ve I want there to be a 3.
Also simple... because once you've done one, you've done them all!
Posted by: Ed on March 11, 2007 1:43 PMI also came up with y=-2x+1, and was feeling all smug until I saw that I wasn't alone.
Posted by: Joe on March 11, 2007 8:25 PM