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

2 次查看（过去 30 天）
Asad Ullah
Asad Ullah 2016-2-23
回答： Steven Lord 2016-2-23
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 ??

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采纳的回答

Steven Lord
Steven Lord 2016-2-23
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

更多回答（1 个）

MHN
MHN 2016-2-23
编辑：MHN 2016-2-23
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 个评论
显示 1更早的评论
Asad Ullah
Asad Ullah 2016-2-23
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 2016-2-23
编辑：MHN 2016-2-23
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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