Problem with using && operator in if conditional statement with array involved

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i want to use if statement such that if ((x_value==645:650||730:735||815:820||900:905||980:985||1070:1075||1155:1160||1240:1145||1325:1330||1410:1415||1495:1500||1580:1585)&&(y_value==225:230)) out= S(1); end
OR
xx=[645:650,730:735,815:820,900:905,985:990,1070:1075,1155:1160,1240:1245,1325:1330,1410:1415,1495:1500,1580:1585]; yy=[225:230;275:280;325:330;375:380];
if ((x_value==xx)&& y_value==(yy(1,:))) out=S(1) end
but it gives error
Operands to the and && operators must be convertible to logical scalar values.
what is wrong with my code ??

Respuesta aceptada

Steven Lord
Steven Lord el 23 de Feb. de 2016
Use ISMEMBER to check if x_value is an element of your set of desired outcomes.
x = 5;
if ismember(x, [1 3 5 7 9])
disp('First trial, odd number less than 10!');
end
x = 2;
if ismember(x, [1 3 5 7 9])
disp('Second trial, odd number less than 10!');
end

Más respuestas (1)

MHN
MHN el 23 de Feb. de 2016
Editada: MHN el 23 de Feb. de 2016
You should use one "&" if you have logical vectors.
% Correct
a = [1,2];
b = [3,4];
if a==a & b==b
c=1;
end
the following code is wrong:
% Wrong
a = [1,2];
b = [3,4];
if a==a && b==b
c=1;
end
  3 comentarios
Asad Ullah
Asad Ullah el 23 de Feb. de 2016
i am using this in a loop and with single & symbol it always skips first if conditions
if any(xx)==x_value & any(yy(1,:))==y_value
out= S(1);
elseif (x_value==648||733||818||903||988||1073||1158||1243||1328||1413||1498||1583)&&(y_value==278)
out= S(2);
elseif (x_value==648||733||818||903||988||1073||1158||1243||1328||1413||1498||1583)&&(y_value==328)
out= S(3);
elseif (x_value==648||733||818||903||988||1073||1158||1243||1328||1413||1498||1583)&&(y_value==378)
out= S(4);
end
MHN
MHN el 23 de Feb. de 2016
Editada: MHN el 23 de Feb. de 2016
Because you are using "any" in a wrong way:
any: True if any element of a vector is a nonzero number or is
logical 1 (TRUE)
so the result of any(xx) is always 1 based on your xx vector. And one is not equal to your x_value. What do you want to do in your first statement?

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