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Ajuda do Scilab >> Funções Elementares > Elementary matrices > meshgrid

meshgrid

Cria matrizes ou arrays 3-D a partir de vetores replicados em 2 ou 3 dimensões

Seqüência de Chamamento

U = meshgrid(u)
[U, V] = meshgrid(u)
[X, Y] = meshgrid(x, y)
[X, Y, Z] = meshgrid(x, y, z)

Parâmetros

u, x, y, z
Vetores de qualquer tipo, de comprimento nx, ny, nz.

U, V
Matrizes quadradas de tamanho nu x nu

X, Y, Z
Matrizes ou hipermatrizes do mesmo tamanho [ny, nx] ou [ny, nx, nz].

Descrição

meshgrid (..) constrói matrizes ou matrizes 3D replicando vetores de entrada ao longo de 2 ou 3 dimensões.

To create arrays of size [nx, ny] instead of [ny, nx], or with more than 3 dimensions, please use ndgrid(x, y) or ndgrid(x, y, z,..).

Most of Scilab 2D or 3D graphical functions like champ(), grayplot(), Sgrayplot(), plot3d(), contour(), etc.. work with grids generated with ndgrid(), not from meshgrid(). Data computed on grids coming from meshgrid() will require being transposed (please see the example thereafter).

Exemplos

[X, Y] = meshgrid(0:2)
--> [X, Y] = meshgrid(0:2)
 X  =
   0.   1.   2.
   0.   1.   2.
   0.   1.   2.

 Y  =
   0.   0.   0.
   1.   1.   1.
   2.   2.   2.

[X, Y] = meshgrid(["a" "bc" "αβγδ"], [-3 5])
--> [X, Y] = meshgrid(["a" "bc" "αβγδ"], [-3 5])
 X  =
!a  bc  αβγδ  !
!a  bc  αβγδ  !

 Y  =
  -3.  -3.  -3.
   5.   5.   5.

Application to grids for graphics:

// Generating data
x = -1:0.1:1.7;
y = -1:0.1:1;
[X, Y] = meshgrid(x, y);
Z = sinc(2*%pi * X.*Y);

// Setting the graphic figure
clf
drawlater
gcf().color_map = parulacolormap(64);
gcf().axes_size = [650 530];

// Plotting
subplot(2,2,1)
Sgrayplot(x, y, Z')
title(["Sgrayplot(x, y, Z'' ) " "$←\;Z^t\; required$"], "fontsize",3)
isoview, colorbar

subplot(2,2,2)
plot3d(x, y, Z', -125,50)
gce().color_flag = 1;
title(["plot3d(x, y, Z'' ) " "$←\;Z^t\; required$"], "fontsize",3)
isoview

subplot(2,2,3)
champ(x,y,sin(2*X'),cos(2*Y'))
title(["champ(x, y, sin(X'' ),cos(Y'' ))" "$←\;X^t\;\;Y^t\; required$"], "fontsize",3)
isoview

subplot(2,2,4)
surf(X, Y, Z)
title("surf(X, Y, Z)", "fontsize",3)
isoview

gcf().children.tight_limits = ["on" "on" "on"];
drawnow

Ver Também

  • ndgrid — constrói matrizes ou matrizes N-D, replicando alguns vetores dadas
  • repmat — Replicate and tile an array
  • feval — múltipla avaliação
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Last updated:
Tue Feb 25 08:52:28 CET 2020