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

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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))

Respuesta aceptada

KALYAN ACHARJYA
KALYAN ACHARJYA el 25 de Feb. de 2021
Editada: KALYAN ACHARJYA el 25 de Feb. de 2021
Replace x with x(i) in all data, then code execute without any error.
More: read about preallocation and logical indexing (MATLAB)

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