info mathgl

6.9 Data information

There are a set of functions for obtaining data properties in MGL language. However most of them can be found using "suffixes". Suffix can get some numerical value of the data array (like its size, maximal or minimal value, the sum of elements and so on) as number. Later it can be used as usual number in command arguments. The suffixes start from point ‘.’ right after (without spaces) variable name or its sub-array. For example, a.nx give the x-size of data a, b(1).max give maximal value of second row of variable b, (c(:,0)^2).sum give the sum of squares of elements in the first column of c and so on.

MGL command: info dat
Method on mglData: const char * PrintInfo () const
Method on mglData: void PrintInfo (FILE *fp) const
C function: const char * mgl_data_info (HCDT dat): Gets or prints to file fp or as message (in MGL) information about the data (sizes, maximum/minimum, momentums and so on).

MGL command: info 'txt': Prints string txt as message.

MGL suffix: (dat) .nx
MGL suffix: (dat) .ny
MGL suffix: (dat) .nz
Method on mglData: long GetNx ()
Method on mglData: long GetNy ()
Method on mglData: long GetNz ()
C function: long mgl_data_get_nx (HCDT dat)
C function: long mgl_data_get_ny (HCDT dat)
C function: long mgl_data_get_nz (HCDT dat): Gets the x-, y-, z-size of the data.

MGL suffix: (dat) .max
Method on mglData: float Maximal () const
C function: float mgl_data_max (HCDT dat): Gets maximal value of the data.

MGL suffix: (dat) .min
Method on mglData: float Minimal () const
C function: float mgl_data_min (HMDT dat) const: Gets minimal value of the data.

Method on mglData: float Minimal (int &i, int &j, int &k) const
C function: float mgl_data_min_int (HCDT dat, int *i, int *j, int *k): Gets position of minimum to variables i, j, k and returns the minimal value.

Method on mglData: float Maximal (int &i, int &j, int &k) const
C function: float mgl_data_max_int (HCDT dat, int *i, int *j, int *k): Gets position of maximum to variables i, j, k and returns the maximal value.

Method on mglData: float Minimal (float &x, float &y, float &z) const
C function: float mgl_data_min_real (HCDT dat, float *x, float *y, float *z): Gets approximated (interpolated) position of minimum to variables x, y, z and returns the minimal value.

MGL suffix: (dat) .mx
MGL suffix: (dat) .my
MGL suffix: (dat) .mz
Method on mglData: float Maximal (float &x, float &y, float &z) const
C function: float mgl_data_max_real (HCDT dat, float *x, float *y, float *z): Gets approximated (interpolated) position of maximum to variables x, y, z and returns the maximal value.

MGL suffix: (dat) .sum
MGL suffix: (dat) .ax
MGL suffix: (dat) .ay
MGL suffix: (dat) .az
MGL suffix: (dat) .aa
MGL suffix: (dat) .wx
MGL suffix: (dat) .wy
MGL suffix: (dat) .wz
MGL suffix: (dat) .wa
MGL suffix: (dat) .sx
MGL suffix: (dat) .sy
MGL suffix: (dat) .sz
MGL suffix: (dat) .sa
MGL suffix: (dat) .kx
MGL suffix: (dat) .ky
MGL suffix: (dat) .kz
MGL suffix: (dat) .ka
Method on mglData: float Momentum (char dir, float &a, float &w) const
Method on mglData: float Momentum (char dir, float &m, float &w, float &s, float &k) const
C function: float mgl_data_momentum_val (HCDT dat, char dir, float *a, float *w, float *s, float *k): Gets zero-momentum (energy, I=\sum dat_i) and write first momentum (median, a = \sum \xi_i dat_i/I), second momentum (width, w^2 = \sum (\xi_i-a)^2 dat_i/I), third momentum (skewness, s = \sum (\xi_i-a)^3 dat_i/ I w^3) and fourth momentum (kurtosis, k = \sum (\xi_i-a)^4 dat_i / 3 I w^4) to variables. Here \xi is corresponding coordinate if dir is ‘'x'’, ‘'y'’ or ‘'z'’. Otherwise median is a = \sum dat_i/N, width is w^2 = \sum (dat_i-a)^2/N and so on.

MGL suffix: (dat) .fst
Method on mglData: float Find (const char *cond, int &i, int &j, int &k) const
C function: float mgl_data_first (HCDT dat, const char *cond, int *i, int *j, int *k): Find position (after specified in i, j, k) of first nonzero value of formula cond. Function return the data value at found position.

MGL suffix: (dat) .lst
Method on mglData: float Last (const char *cond, int &i, int &j, int &k) const
C function: float mgl_data_last (HCDT dat, const char *cond, int *i, int *j, int *k): Find position (before specified in i, j, k) of last nonzero value of formula cond. Function return the data value at found position.

Method on mglData: int Find (const char *cond, char dir, int i=0, int j=0, int k=0) const
C function: float mgl_data_find (HCDT dat, const char *cond, int i, int j, int k): Return position of first in direction dir nonzero value of formula cond. The search is started from point {i,j,k}.

Method on mglData: bool FindAny (const char *cond) const
C function: float mgl_data_find_any (HCDT dat, const char *cond): Determines if any nonzero value of formula in the data array.

MGL suffix: (dat) .a: Give first (for .a, i.e. dat->a[0]).

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