error reported using find function in legend

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Chong Tao
Chong Tao 2013-10-16
评论： Chong Tao 2013-10-17
I'm trying to add a legend to a plot to show which line is plotted. when using find function to get the indexes of plot handles, it report error of " Index exceeds matrix dimensions." I dont know why it failed.
It works fine, if I use somethin like: legend(hp(1:Nms),get(hst(1:Nms),'string'));
Below is my code, any help is appreciated.
function gui_test
clear all;
fh = figure('Visible','on','position',[50,60, 660, 400]);
hax = axes('Units','pixels','Position',[60,90,400,300],'color','black','ylim',[-1 1]);
hpb1 = uicontrol('Style','pushbutton','String','RUN',...
'position',[500 200, 80, 40],'Callback',{@run_Callback});
hst(1)= uicontrol('style','text','string','line1',...
'units','pix','position',[500 155 55 13]);
hst(2) = uicontrol('style','text','string','line2',...
'units','pix','position',[500 135 55 13]);
hst(3) = uicontrol('style','text','string','line3',...
'units','pix','position',[500 115 55 13]);
hst(4) = uicontrol('style','text','string','line4',...
'units','pix','position',[500 95 55 13]);
c = zeros(4,3)
function run_Callback(~,~)
for i=1:4,
x=0:0.001:10;
y = 1.8*sin(i*0.2.*x).*cos(0.3.*x);
if min(y)> -1
hold all;
hp(i)= plot(x,y);
c(i,3)=1; % flag it if it is plotted
end
end
legend(hp(find(c(:,3))),get(hst((find(c(:,3))),'string')))
end
end

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采纳的回答

Vivek Selvam
Vivek Selvam 2013-10-16
编辑：Vivek Selvam 2013-10-16
You had added an extra set of parenthesis:
hst((...),'string') --> hst(...),'string'
Here is the fixed line:
lh = legend(hp(find(c(:,3))),get(hst(find(c(:,3))),'string'))
set(lh,'TextColor','w') % legend text is white now
  3 个评论
显示 1更早的评论
Vivek Selvam
Vivek Selvam 2013-10-17
Chong Tao, here is the update you asked for:
lhKids = get(lh,'Children');
lhText = sort(lhKids(strcmp(get(lhKids,'Type'),'text')));
lineColors = get(hp(find(c(:,3))),'Color');
set(lhText,{'Color'},lineColors)
Chong Tao
Chong Tao 2013-10-17
Thanks again, Vivek. This is very helpful.

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