6.6 Make another data

Method on mglData: mglData SubData (int xx, int yy=-1, int zz=-1) const

Extracts sub-array data from the original data array keeping fixed positive index. For example SubData(-1,2) extracts 3d row (indexes are zero based), SubData(4,-1) extracts 5th column, SubData(-1,-1,3) extracts 4th slice and so on. The most convenient way is to use this function as initialization of other mglData variable like mglData a1(a.SubData(-1,-1,3)).

Method on mglData: mglData Column (const char *eq) const

Get column (or slice) of the data filled by formula eq of other named columns. For example, Column("n*w^2/exp(t)");. The column ids must be defined first by SetColumnId() function.

Method on mglData: void SetColumnId (const char *ids)

Set the symbol id for data columns. The string must contain one symbol 'a'...'z' per column (without spaces).

Method on mglData: mglData Hist (int n, float v1=0, float v2=1, int nsub=0) const

Creates n-th points distribution of the data values in range [v1, v2]. Parameter nsub define the number of additional interpolated points (for smoothness of histogram).

Method on mglData: mglData Hist (const mglData &w, int n, float v1=0, float v2=1, int nsub=0) const

Creates n-th points distribution of the data values in range [v1, v2]. Array w specifies weights of the data elements. Parameter nsub define the number of additional interpolated points (for smoothness of histogram).

Method on mglData: mglData Momentum (char dir, const char *how) const

Get momentum (1D-array) of the data along direction dir. String how contain kind of momentum. The momentum is defined like as res_k = \sum_ij how(x_i,y_j,z_k) a_ij/ \sum_ij a_ij if var=‘z’ and so on. Coordinates ‘x’, ‘y’, ‘z’ are data indexes normalized in range [0,1].

Method on mglData: mglData Sum (const char *dir) const

Gets array which is the result of summation in given direction or direction(s).

Method on mglData: mglData Max (const char *dir) const

Gets array which is the maximal data values in given direction or direction(s).

Method on mglData: mglData Min (const char *dir) const

Gets array which is the maximal data values in given direction or direction(s).

Method on mglData: mglData Combine (const mglData &a) const

Return direct multiplication of arrays (like, res[i,j] = this[i]*a[j] and so on).

Method on mglData: mglData Evaluate (const mglData &idat, bool norm=true) const

Method on mglData: mglData Evaluate (const mglData &idat, const mglData &jdat, bool norm=true) const

Method on mglData: mglData Evaluate (const mglData &idat, const mglData &jdat, const mglData &kdat, bool norm=true) const

Get array which values is result of interpolation of original array for coordinates from other arrays. All dimensions must be the same for data idat, jdat, kdat. Coordinates from idat, jdat, kdat are supposed to be normalized in range [0,1] (if norm=true) or in range [0,nx], [0,ny], [0,nz] correspondingly.

Method on mglData: mglData Resize (int mx, int my=1, int mz=1, float x1=0, float x2=1, float y1=0, float y2=1, float z1=0, float z2=1) const

Resizes the data to new size mx, my, mz from box (part) [x1,x2] x [y1,y2] x [z1,z2] of original array. Initially x,y,z coordinates are supposed to be in [0,1].