ChartDirector Ver 3.1 (PHP Edition Edition)

ArrayMath.med

Usage

med()

Description

Get the median value of the elements of the ArrayMath object.

Arguments

None

Return Value

The median value of the elements of the ArrayMath object.

© 2004 Advanced Software Engineering Limited. All rights reserved.
ved. nt, LOWESS finds the n nearest points to that data point (n is configurable), and performs weighted linear regression using a tricube weighting function. It then adjust the coordinates of the data point based on the result of the weighted linear regression.

LOWESS can run in multiple iterations, in which case it should converge to a stable curve - thus it is called "robust".

In most cases, LOWESS behaves better than many other smoothing algorithms, such as moving average, moving median, exponential average. Curves draw using LOWESS look smoother, yet they track the data points better. Also, LOWESS behaves well at the end points. On the other hand, methods based on moving windows (e.g. moving averages) do not work on the first few data points, because they need sufficient data points to fill the moving window first.

In this method, each element of the ArrayMath object will be replaced by the corresponding value computed using the LOWESS algorithm.

Arguments

ArgumentDefaultDescription
smoothness0.25The smoothness factor. It must be between 0 - 1. It is the portion of points used in finding the n nearest points. In other words, n = smoothness * no_of_points. A larger value will result in a smoother the curve. A smaller value will result in the curve tracking the data points better.

For LOWESS to have any smoothing effect at all, n must be at least 3. You may need to use a large smoothness factor if you only have a few data points.
iteration0The number of additional iteration used in the LOWESS algorithm. Unless your data is extremely noisy, in most case no additional iteration is necessary.

Return Value

The current ArrayMath object.

© 2004 Advanced Software Engineering Limited. All rights reserved.
checking if the elements of the given decisionArray is less than or equal to zero.selectEQZ(Self)Select the elements of the ArrayMath object by checking if the elements of the given decisionArray is equal to zero.selectNEZ(Self)Select the elements of the ArrayMath object by checking if the elements of the given decisionArray is not equal to zero.selectStartOfHour(Self)Select the elements of the ArrayMath object that represents a different hour from the previous element.selectStartOfDay(Self)Select the elements of the ArrayMath object that represents a different day from the previous element.selectStartOfWeek(Self)Select the elements of the ArrayMath object that represents a different week from the previous element.selectStartOfMonth(Self)Select the elements of the ArrayMath object that represents a different month from the previous element.selectStartOfYear(Self)Select the elements of the ArrayMath object that represents a different year from the previous element.trim(Self)Trim the ArrayMath object by keeping only some elements in the middle.insert(Self)Insert the elements of an array to the ArrayMath object.insert2(Self)Insert some constant elements to the ArrayMath object.replace(Self)Find elements that are equal to a given value and replace it with another value.movAvg(Self)Replace each element of the ArrayMath object by its moving average.expAvg(Self)Replace each element of the ArrayMath object by its exponential average.movMed(Self)Replace each element of the ArrayMath object by its moving median.movPercentile(Self)Replace each element of the ArrayMath object by its moving percentile.movMax(Self)Replace each element of the ArrayMath object by its moving maximum.movMin(Self)Replace each element of the ArrayMath object by its moving minimum.movStdDev(Self)Replace each element of the ArrayMath object by its moving standard deviation.movCorr(Self)Replace each element of the ArrayMath object by the moving correlation with another array or with itself.lowess(Self)Fit a curve through the data points in the ArrayMath object using the LOWESS algorithm.lowess2(Self)Fit a curve through the data points in the ArrayMath object using the LOWESS algorithm, where the spacing of the data points is supplied by the given array.result(Self)Get the content of the ArrayMath object as a normal array to be used in other ChartDirector API.max(Self)Get the maximum value of the elements of the ArrayMath object.min(Self)Get the minimum value of the elements of the ArrayMath object.avg(Self)Get the average value of the elements of the ArrayMath object.sum(Self)Get the total value of the elements of the ArrayMath object.med(Self)Get the median value of the elements of the ArrayMath object.percentile(Self)Get the required percentile value of the elements of the ArrayMath object.maxIndex(Self)Get the index of the maximum value element of the ArrayMath object.minIndex(Self)Get the index of the minimum value element of the ArrayMath object.
© 2004 Advanced Software Engineering Limited. All rights reserved.
(1059, '1999-03-01', '371', '635', '722');