couldnt able to use switch statement with string

w=input('enter the weight ')
material=input('enter type of material ','s');
material=lower('material');
f1=0.2*w;
f2=0.35*w;
f3=0.4*w;
f4=0.7*w;
switch material
    case 'mmetal'
        disp(f1)
    case 'wwood'
        disp(f2)
    case 'mwood'
        disp(f3)
    case 'rcon'
        disp(f4)
    otherwise 
        disp('error')
end

it is jumping to otherwise line

and can we use mathematical operation and display that result under 'case' section

i.e for example

case mm

force =w*0.3

Answer 1

[Fangjun Jiang]

material=lower(material); without the single quote.