if statement not working
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Marisabel Gonzalez
le 5 Avr 2019
Commenté : Marisabel Gonzalez
le 5 Avr 2019
Hi, my following piece of code does not work as it expected to and I don't know how to fix it yet. Any suggestions? Thanks!
A = [5;5;5;3;3;2];
B = [10;4;10;10;4;4];
if A == 5
plot(A,B,'rx')
elseif A == 3
hold on
plot(A,B,'bx')
else
hold on
plot(A,B,'gx')
end
2 commentaires
Stephen23
le 5 Avr 2019
"if statement not working"
Did you read the IF documentation (to know how it works with non-scalar conditions), before deciding that it is "not working" ?
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Rik
le 5 Avr 2019
Modifié(e) : Rik
le 5 Avr 2019
What you probably think should happen is in the code below, however, there is a better way.
A = [5;5;5;3;3;2];
B = [10;4;10;10;4;4];
figure(1)
clf(1),axes;
for n=1:numel(A)
if A(n) == 5
plot(A(n),B(n),'rx')
elseif A(n) == 3
hold on
plot(A(n),B(n),'bx')
else
hold on
plot(A(n),B(n),'gx')
end
end
axis([1 6 3 11])
The better way is to use logical indexing:
A = [5;5;5;3;3;2];
B = [10;4;10;10;4;4];
figure(1),clf(1)
already_plotted=false(size(A));
L= A == 5;
plot(A(L),B(L),'rx')
already_plotted(L)=true;
hold on
L= A == 3 & ~already_plotted;
plot(A(L),B(L),'bx')
already_plotted(L)=true;
L= ~already_plotted;
plot(A(L),B(L),'gx')
axis([1 6 3 11])
axis([1 6 3 11])
3 commentaires
Rik
le 5 Avr 2019
See my edited answer. You will only see 5 points, because two of them overlap (5,10).
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