how to get convolution of two polynomials

hello

i want to multiply the following polynomials f1=[1 2 a 3 4] , f2=[0 2 3 5 1]

however, with the conv command i am getting an error due to 'a' . i have also used the command str2num to covert it but still i am not getting the multiplication any ideas?

[Star Strider]

Do you have the Symbolic Math Toolbox?

[t]

no.

Answer 1

[Image Analyst]

How are those polynomials? Are they coefficients of powers of x or something? Of course you wouldn't use str2num. If "a" is a variable, that should be fine as is.

a = 10; % whatever
f1=[1 2 a 3 4]
f2=[0 2 3 5 1]
output = conv(f1, f2)

In the command window:

output =
     0     2     7    31    47    69    37    23     4

Answer 2

[t]

i want the result in respect of 'a'. 'a' is any integer number. you assigned a value of 10 to a.

[Star Strider]

Setting a = 10 seems to me to fit the definition of ‘any integer number’. If it’s not the number you were thinking, you can’t fault Image Analyst for not guessing it!

I solved this for a in the Symbolic Math Toolbox, but haven’t posted it because I have no idea what you want. (There are two real and two complex values.)