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index out of bounds

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dingyi duan
dingyi duan on 30 Oct 2015
Commented: dingyi duan on 30 Oct 2015
hi guys, new to matlab and came across a simple problem that takes me forever to get over. please help.
if rgb(1)==1
if rgb(2)==1
if rgb(3)==1
color='white';
else
color='yellow';
end
else
if rgb(3)==1
color='magenta';
else
color='red';
end
end
else
if rgb(1)==1
if rgb(3)==1
color='cyan';
else
color='green';
end
else
if rgb(3)==1
color='blue';
else
color='invalid input';
end
end
end
so its pretty much just mix three primary colors as input and output the mixed color.. i have a hard time going through this and i don't know where i did wrong.. thanks for answering. oh and here's the error:
Attempted to access rgb(3); index out of bounds because numel(rgb)=1.
Error in rgb_color (line 26) if rgb(3)==1

Accepted Answer

Ilham Hardy
Ilham Hardy on 30 Oct 2015
Edited: Ilham Hardy on 30 Oct 2015
What is your rgb value?
The error message is very clear. it stated that you tried to access the third index of rgb, whilst rgb only contains one value ( numel(rgb)=1).
Btw, you can also use logical operator instead of nested if-else statement
  5 Comments
Walter Roberson
Walter Roberson on 30 Oct 2015
How are you invoking your code? I can see your file is named rgb_color.m but how are you starting it running?
dingyi duan
dingyi duan on 30 Oct 2015
alright guys.. i just found out whats wrong: its my input.. this code is fine.. thanks all for helping.

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More Answers (1)

Stephen23
Stephen23 on 30 Oct 2015
Edited: Stephen23 on 30 Oct 2015
If you want to look up colornames then use my FEX submission colornames:
It is very simple to use:
>> colornames('html',[0.4,0.1,0.6])
ans = 'Purple'
>> colornames('html',[0.8,0.9,0.3])
ans = 'Yellow'
>> colornames('html',[1,1,1])
ans = 'White'
  1 Comment
dingyi duan
dingyi duan on 30 Oct 2015
thx but sry i have to use nested if...

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