It's also worth to mention that the produced seq is lazy, so you can
work on big images without memory issues.
On Saturday, May 29, 2010, John Cromartie <jcromar...@gmail.com> wrote:
>
> This is precisely what 'for' is for in clojure.
>
> For example:
>
> (for [x (range 10) y (range 10)] [x y])
>
> ... produces a sequence of the coordinates in a 10x10 grid. You can
> then consume the sequence for whatever purpose. The position of each
> matrix coord in the seq produced would match up with the position of
> the data in your array.
>
> On May 29, 9:19 am, WoodHacker <ramsa...@comcast.net> wrote:
>> I've been working with Lisp and Scheme for the past few years and have
>> migrated to Clojure because of the JVM. I think I get functional
>> programming, but one problem is giving me fits.
>>
>> I'm working on a simple imaging problem. I want to copy an array of
>> pixels to an image buffer. That means that I have to deal both with
>> an array and a matrix (x and y). As I go along my array, each time x
>> reaches the end of a line in the matrix I have to set it back to zero
>> and increment y.
>>
>> I can find no simple way to do this without getting a compile error.
>> Can someone show me how to do this?
>>
>> Example in pseudo code:
>>
>> x = 0
>> y = 0
>>
>> for (k = 0; k < 256; ++k)
>> if (= x 16) {
>> x = 0
>> (inc y)
>> }
>> else
>> (inc x)
>>
>> writeBuffer (x, y, value[k])
>>
>> Bill
>
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