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

%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 .

[Image Analyst]

You don't have a loop at all! There is no "for" and an "if" block is not a loop.

Answer 1

[Image Analyst]

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.

Answer 2

[Marta Salas]

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)

[Thayumanavan]

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]

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);

Answer 3

[Horia]

Try: if condition 1 do something else if condition 2 do the samething; else do something else break; end; end;

Answer 4

[sai m]

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.