help with plz

% Note :- in this code y & x has 10 values, but every time I run % the command it will give me this error... %*(??? Operands to the and && operators must be convertible to logical scalar values.)*

Error in ==> dewpointT at 75 if (abs(raw(1)) < 1e-5 && abs((y./K)-x) < 1e-5)

 raw(1)= sum(y./K)-1;

 if (abs(raw(1)) < 1e-5 && abs((y./K)-x) < 1e-5)

         break

[Jan]

Please use a meaningful subject line and tags.

Answer 1

[Titus Edelhofer]

Hi,

if y and x are vectors, then abs((y./K)-x)<1e-5) is a (logical) vector as well. You will need to decide, if the relation must hold for at least one index, or for all of them. Replace by

any(abs((y./K)-x)<1e-5))

or

all(abs((y./K)-x)<1e-5) )

accordingly.

Titus

Answer 2

[Jan]

The error message is very clear: "Operands to and && operators must be convertible to logical scalar values." It is always worth to read the error messages of Matlab.

[Nasir Qazi]

it works with '&' instead of '&&'

[Walter Roberson]

Nasir, it doesn't bomb out with an error if you change to &, but that doesn't mean that it works. Please review Titus's response and study the documentation for "any" and "all"