Operands to the || and && operators must be convertible to logical scalar values.

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Thayumanavan
Thayumanavan 2014-4-10
回答： sai m 2015-3-3
%Code x=[1.01 ;2.23; 3.456 ;4.11; 5.897 ;6.234; 7.456; 8.567; 9.110; 10.333];
a=0;
if((x>=5.2)&&(x<=8.50))
disp('Inside if loop');
a=a+1;
end
a
I want the no of values greater than some value and less than some value in a 1D array. If i am going for if statement with sysntax if((x(:,1)>=5.2)&&(t(:,1)<=8.50)) i am getting Operands to the and && operators must be convertible to logical scalar values error.
If i use if((x(:,1)>=5.2)&(t(:,1)<=8.50)) flow is not going inside the loop and i am not able to get the count as 3 .

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采纳的回答

Image Analyst
Image Analyst 2014-4-10
Try this:
x=[1.01 ;2.23; 3.456 ;4.11; 5.897 ;6.234; 7.456; 8.567; 9.110; 10.333];
for k = 1 : length(x)
if x(k) >= 5.2 && x(k) <=8.50
fprintf('x(%d) = %f and is in range so we are inside if block.\n', k, x(k));
end
end
In command window:
x(5) = 5.897000 and is in range so we are inside if block.
x(6) = 6.234000 and is in range so we are inside if block.
x(7) = 7.456000 and is in range so we are inside if block.

更多回答（3 个）

Marta Salas
Marta Salas 2014-4-10
编辑：Marta Salas 2014-4-10
find returns the indexes of the values that holds the condition 5.2=< x >=8.50
index = find(x>=5.2 & x<=8.50)
To know the number of values, you can check the size of index
length(index)
  2 个评论
Thayumanavan
Thayumanavan 2014-4-10
Thanks,As per find command I got the count as 3. I also tried for loop as follows:
x=[1.01 ;2.23; 3.456 ;4.11; 5.897 ;6.234; 7.456; 8.567; 9.110; 10.333];
a=0;
arraysize=length(x);
for i=1:arraysize
if ((x(i,1)>=5.2)&&(x(i,1)<=8.50))
a=a+1;
else
disp('not going inside loop');
end
end
disp('the count is');
a
.once again Thanks .
Marta Salas
Marta Salas 2014-4-10
That code works for me.
I would suggest you to use fprintf instead of disp to print comments with variables
fprintf('the count is %d \n',a);

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Horia
Horia 2014-5-18
Try: if condition 1 do something else if condition 2 do the samething; else do something else break; end; end;
sai m
sai m 2015-3-3
if(get(handles.radiobutton1,'Value') == 0 && get(handles.radiobutton2,'Value') == 0 && get(handles.radiobutton5,'Value') == 0 && get(handles.radiobutton6,'Value' == 0 && get(handles.radiobutton7,'Value') == 0 && get(handles.radiobutton8,'Value') == 0 && get(handles.radiobutton9,'Value') == 0 && get(handles.radiobutton10,'Value') == 0)) errordlg('No option selected','File Error'); %user did not select any radio button, then do this guidata(hObject, handles); end;
error ??? Operands to the and && operators must be convertible to logical scalar values.

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