Changing Default Function Matlab?

I'm trying to run the following code:

clear tf; a = tf([5],[0.8 1])

which gives "Undefined function 'tf' for input arguments of type 'double'."

I checked for license and got the following reply

 license('test', 'control_toolbox')

ans =

     1

I tried which tf -all

which gave me the following response C:\Program Files\MATLAB\R2012b\toolbox\ident\ident\@idParametric\tf.m % idParametric method C:\Program Files\MATLAB\R2012b\toolbox\shared\controllib\engine\@StaticModel\tf.m % StaticModel method C:\Program Files\MATLAB\R2012b\toolbox\signal\signal\@dfilt\tf.m % dfilt method

so is the error due to the fact that the default tf function is not the desired one. and if so then how to solve the problem???

Answer 1

[Luuk van Oosten]

Dear Tanmay,

Looks like your input arguments for the function 'tf' must be of the type 'single'.

Example: if 'B' is of the type double, you can make it a single by:

A = single(B)