Multiple conditions in an IF statement and they are not logical scalar values

Here is the sample code that I have written and keep getting this error:

n=input('Enter the values: ');

xmax=input('Enter the Maximum: ');

xmin=input('Enter the Minimum: ');

delx=(xmax-xmin)/(n-1);

for i=1:n

x(i)=xmin-(i-1)*delx;

if ((x>=0) && (x<=2))

m(i)=20*x-4.5*x^2;

elseif ((x>=2) && (x<=4))

m(i)=20*x(i)-18*(x(i)-1);

else

m(i)=20*x-30-18*(x(i)-1);

end

end

plot(x,m)

The Matlab output is below:

>> PracticeExamME1905

Enter the values: 101

Enter the Maximum: 6

Enter the Minimum: 0

Operands to the || and && operators must be

convertible to logical scalar values.

Error in PracticeExamME1905 (line 7)

if ((x>=0) && (x<=2))

Answer 1

[KALYAN ACHARJYA]

Replace x with x(i) in all data, then code execute without any error.

More: read about preallocation and logical indexing (MATLAB)