How to create a matrix with variables?

Hello,

I am kind of new to Matlab so the questions I will ask probably sound a bit basic. Anyways, here goes:

I want to create the matrix below which has both constants and variables. How can I do this? I know how to create a normal matrix (e.g. B = [1 0 2; 3 4 5; 0 2 3] but I don't know how to create matrices with variables in them?

I tried to type the matrix in as is shown above but it doesn't seem to work. I'm pretty sure I should be following some sort of method but I have no clue.

I want to have the ability to assign different values to the variables at later stages as well.

Answer 1

[Azzi Abdelmalek]

v={0 1;'act*fr' 'y'}

Answer 2

[Walter Roberson]

It is not possible to plot a matrix that has unassigned variables in it. If you have the symbolic toolkit, it is possible to create such a matrix, but in order to plot you need to substitute particular numeric values.

The matrix looks to me to be a transformation matrix for 3D points. You do not plot transformation matrices themselves: you plot the results of transforming something.

[BZ0892]

Really sorry for the confusion. Not sure why I used the term 'plot' rather than 'create'. What I am looking to do is to create this matrix. I will edit my original post now to avoid confusion.

Could you expand on the symbolic toolkit part?

Thanks :)

[Walter Roberson]

Is dt/Vr intended to represent a derivative? If so is Vr a distinct variable? Are Act or Fr or Fc functions of t and or/ Vr and Vc ?

[BZ0892]

Apart from element a31, all the elements are constants that I've been given. Element a31 can vary since the ''Act'' term can vary. I understand that I can just enter the constants instead for the other elements, but for now I'd like to enter the elements so it looks like the image I posted.

Thanks!

EDIT: I'd like to add that in element a44, there should be no ''/'' sign. That is a mistake. It should be just 1-Fc*dt/Vc.

[Walter Roberson]

Assign values to dt Fr Fc Vc Vr

then

   syms Act
   A = [1 0 0 0; 0 1 0 0; Act*Fr*dt/Vr 0 ... and the rest of the terms]