Algorithms

foreach (vector in Vectors)
{
    previousImage = image;
    image.shiftBy (vector);
    image.andWith (previousImage);
}

BobJanova wrote:

I'm going to guess this is to do with financial markets.

BobJanova wrote:

I've been there myself, and I'll warn you, those trends are not nearly so real as the eye makes them look!

BobJanova wrote:

The simplest approach is to smooth out the 'noise' (all the little bumps between B and C) by applying a moving average, gaussian smooth or similar to the data, and then look for peaks and troughs in the smoothed signal. Alternatively you can differentiate the smoothed version which will give you a trend measurement and then look for where that is positive or negative (essentially the same thing from a different angle). But that means you are applying a preconception as to what is 'noise' and what is 'real data' which obviously affects the answer you get.

Can you tell me more about it? why you think that?

Newbie18 wrote:

If a message is released exactly at the turning point of a chart and if similar chart/message patterns (i know, this is the second big difficulty: how do you define Text-Similarity?) often occur, i'd guess the probability of a similar message causing a similar chart pattern is high.

"We have managed to stop the decline in growth."

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

Eddy Vluggen wrote:

Computing text-similarity is easy.

Eddy Vluggen wrote:

To make things worse, most of those turning-points will not be attributable to a single headline.

Newbie18 wrote:

Now i'm curious. How would you do that?

Newbie18 wrote:

If it can find a "class" of messages, that are similiar to each other

Newbie18 wrote:

I know, it's not likely that my ideas are realizable, and if they are, most probably some Bank or Hedge Fund has already done it

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

Richard MacCutchan wrote:

date of Easter for any year, based on the first full moon after March 21st.

Date.prototype.Easter   =   // Date of Easter Sunday for the year that the date object represents or for a given year
    function(optYear)   // Optionally can override year that the date is for
        // optYear can be a Date object or a numeric year
    {
        var year    = optYear
            ?   (   optYear.constructor == Date
                ?   optYear.getFullYear()
                :   ( optYear < 1900 ? optYear + 1900 : optYear )   // Assume number
                )
            :   this.getFullYear();

        // Algorithm optimised from 'Puzzles and Paradoxes' by T H O'Beirne
        // (Oxford University Press, London (c) 1965)
        var a   = year % 19;
        var b   = Math.floor(year / 100);
        var c   = year % 100;
        var d   = Math.floor(b / 4);
        var h   = (19 * a + b - d - Math.floor((8 * b + 13) / 25) + 15) % 30;
        var mu  = Math.floor((a + 11 * h) / 319) - h;
        var lambda  = (2 * (b - d * 4) + Math.floor(c / 4) * 6 - c + mu + 32) % 7 - mu;
        var month   = Math.floor((lambda + 90) / 25);

        return  new Date(year, month - 1, (lambda + month + 19) % 32);
    };  // Date.prototype.Easter