3.13.2 Vect

Method on mglGraph (C++, Python): void Vect (const mglData &x, const mglData &y, const mglData &ax, const mglData &ay, const char *sch="", float zVal=NAN, int flag=0)

C function: void mgl_vect_xy (HMGL gr, const HMDT x, const HMDT y, const HMDT ax, const HMDT ay, const char *sch, float zVal, int flag)

The function draws plane vector field plot for the field {ax, ay} depending parametrically on coordinates x, y at level z=zVal. The length and color of arrows are proportional to \sqrtax^2+ay^2. The number of arrows depend on MeshNum (see section Other settings). The color is specified by the string argument sch. Previous color scheme is used by default. Parameter flag is bitwise flag for setup the hachures (arrows): MGL_VEC_COL for drawing bi-color arrow, MGL_VEC_LEN for drawing fixed length arrows, MGL_VEC_DOT for drawing hachures with dots instead of arrows, MGL_VEC_END for drawing arrows to the cell point, MGL_VEC_MID for drawing arrows with center at cell point. The size of ax and ay must be equal. The minor dimensions of arrays x, y and ax must be equal too. Arrays x and y can be vectors (not matrices as ax). The vector field is plotted for each z slice of ax, ay. See also VectL, VectC, Flow, Dew. See section Vect sample, for sample code and picture.

Method on mglGraph (C++, Python): void Vect (const mglData &ax, const mglData &ay, const char *sch="", float zVal=NAN, int flag=0)

C function: void mgl_vect_2d (HMGL gr, const HMDT ax, const HMDT ay, const char *sch, float zVal, int flag)

The same as previous with x, y equidistantly distributed in interval [Min, Max].

Method on mglGraph (C++, Python): void Vect (const mglData &x, const mglData &y, const mglData &z, const mglData &ax, const mglData &ay, const mglData &az, const char *sch="", int flag=0)

C function: void mgl_vect_xyz (HMGL gr, const HMDT x, const HMDT y, const HMDT z, const HMDT ax, const HMDT ay, const HMDT az, const char *sch, int flag)

This is 3D version of the first functions. Here arrays ax, ay, az must be 3-ranged tensors with equal sizes and the length and color of arrows is proportional to \sqrtax^2+ay^2+az^2. See section Vect 3D sample, for sample code and picture.

Method on mglGraph (C++, Python): void Vect (const mglData &ax, const mglData &ay, const mglData &az, const char *sch="", int flag=0)

C function: void mgl_vect_3d (HMGL gr, const HMDT ax, const HMDT ay, const HMDT az, const char *sch, int flag)

The same as previous with x, y equidistantly distributed in interval [Min, Max].