MATLAB: Am I getting this error “Operands to the || and && operators must be convertible to logical scalar values.”

operands error

function ThCond
  alloy = input('Enter the type of metal alloy:', 's');
  T = input('Enter temperature(K) to calculate thermal conductivity:','s');
      switch alloy
          case 'Al2'
                  if (298 <= T) && (T <= 840)
                      k = 149.7+0.0809*T-(1*10^(-4))*(T^2);
                        fprintf('\nThe thermal conductivity(k_s) is $%6.2f\n', k')
                    elseif (298 <= T) && (T <= 773)
                        k = 76.64 + 0.2633*T - (2*10^(-4))*(T^2);
                        fprintf('\nThe thermal conductivity(k_s) is $%6.2f\n', k')
                    else
                        disp('Invalid Temperature Input!');
                    end
       end
  end

Best Answer

Delete the 's' from the temperature input. You want a number, not a string.

T = input('Enter temperature(K) to calculate thermal conductivity: ');

Then it works.

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