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

I get an operators error... Not sure why. Can you help out?

Here is the code:

while count<=i
     mfg=G(count)
     if mfg == 27 && mfgdate2 >= 1946 && mfgdate<= 1974 || mfg == 27 && mfgdate>= 1983 && mfgdate<= 1988     
        MfgScore(count,:)=3;
    end
    count=count+1;
end

Answer 1

[Walter Roberson]

Either mfgdate or mfgdate2 are not scalar. You probably need to index them with count

It is suspicious that you use mfgdate2 only once in the expression

Answer 2

[Faustino Quintanilla]

Fixed by adding count to elseif statement:

   while count<=i
        mfg=G(count);% Priority idnetifier
        if mfg == 15                           
            MfgScore(count,:)=5;
        elseif mfg == 20                        
            MfgScore(count,:)=5;
        elseif mfg == 8 && mfgdate2(count)>= 1967 && mfgdate2(count)<= 1998   
            MfgScore(count,:)=4;
        elseif mfg == 9 && mfgdate2(count)>= 1960 && mfgdate2(count)<= 1971    
            MfgScore(count,:)=2;
        elseif mfg == 27 && mfgdate2(count)>= 1946 && mfgdate(count)<= 1974 || mfg == 27 && mfgdate(count)>= 1983 && mfgdate(count)<= 1988       
            MfgScore(count,:)=3;                                                                                                              
        elseif mfg == 1 && mfgdate2(count)>= 1949 && mfgdate2(count)<= 1969    
            MfgScore(count,:)=5;
        elseif mfg == 13 && mfgdate2(count)>= 1963 && mfgdate2(count)<= 1964    
            MfgScore(count,:)=2;
        elseif mfg == 19 && mfgdate2(count)>= 1962 && mfgdate2(count)<= 1967    
            MfgScore(count,:)=2;    
        end
        count=count+1;
    end

[Walter Roberson]

I find it suspicious that

          elseif mfg == 27 && mfgdate2(count)>= 1946 && mfgdate(count)<= 1974 || mfg == 27 && mfgdate(count)>= 1983 && mfgdate(count)<= 1988

is the only place that uses mfgdate instead of mfgdate2, and that in the middle of the expression mfgdate2 is the lower bound but mfgdate is the upper bound. It would make more sense to me if you had

          elseif mfg == 27 && mfgdate2(count)>= 1946 && mfgdate2(count)<= 1974 || mfg == 27 && mfgdate(count)>= 1983 && mfgdate(count)<= 1988