create multiple figures of patches with random colors

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Declan Bourke
Declan Bourke 2016-6-27
评论： Lina KORONFEL 2020-7-7
I'm trying to create a number of patches with different colors using a random number function and all of the regular colors in MATLAB (i.e. g,r,b etc). I'm using a 'for' loop and assigning a new color to the patch each time but for some reason the script returns patches with the same color every time. The section of scripts i'm using now is:
for i=1:12
figure
col_list='ymcrgbk';
col=randi([1,7],1);
random_color=col_list(col);
patch_x=[0 2 2 0]
patch_y=[0 0 2 2]
final_color=['-' random_color]
patch(patch_x,patch_y,'final_color');
end
  2 个评论
Stephen23
Stephen23 2016-6-27
编辑：Stephen23 2016-6-27
Note that operations which do not depend on the loop variable should be moved outside of the loop. For example it would be much more efficient to call randi just once before the loop rather than multiple times inside the loop.
Also note that using i or j as the loop variable is not recommended as it is the name of the inbuilt imaginary unit.
See my answer for a more efficient way of writing a loop like this.
Declan Bourke
Declan Bourke 2016-6-27
That's great, i will make a note for the future and stop using i for the loop variable.
Thanks for the advice,
Declan

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采纳的回答

Stephen23
Stephen23 2016-6-27
编辑：Stephen23 2016-6-27
N = 12;
vec = 'ymcrgbk';
clr = vec(randi(numel(vec),N));
figure
for k = 1:N
X = [0,2,2,0]+k;
Y = [0,0,2,2];
patch(X,Y,clr(k));
end

更多回答（1 个）

KSSV
KSSV 2016-6-27
clc; clear all ;
for i=1:12
figure
col_list='ymcrgbk';
col=randi([1,7],1);
random_color=col_list(col) ;
patch_x=[0 2 2 0] ;
patch_y=[0 0 2 2] ;
final_color=['-' random_color] ;
patch(patch_x,patch_y,random_color);
end

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