MATLAB: How to create an array of symbolic matrices

MATLABsymbolictoolbox

I need to create an array of symbolic matrices. But when I try this code:

syms a b c
x(6) = [a b; c 0]

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

Best Answer

Use it as a cell...

syms a b c
x{6} = [a b; c 0]

Related Solutions

MATLAB: How to assemble matrices

It is a FEM problem. You cannot expect a FEM solution in MATLAB community. You have to assemble stiffness matrices based on your nodal connectivity. YOu may refer the below link to understand how to assemble the local stiffness matrix to global matrix.

http://in.mathworks.com/matlabcentral/fileexchange/32029-plate-bending/content/Plate%20Bending/assemble.m

You can extend the analogy to your 3D.

MATLAB: Can you index matrices

The following:

 M(5:8, 3:7)

is an array that corresponds to the block defined by rows 5 to 8 of M and columns 3 to 7. As these ranges can be defined by vectors/arrays content, you can build flexible solutions for block-indexing M.

 rIds = ... ;           % rIds and cIds could be defined as a function of a loop
 cIds = ... ;           % index variable, e.g. based on vectors of block 
                        % boundaries in terms of row IDs and column IDs:
                        % rIds = rBoundaries(ii):rBoundaries(ii+1) ; ..
 block = M(rIds, cIds) ;

If you wanted your blocks to be stored separately in a cell arrays, you could use the function mat2cell(). It would take M as a first arg and essentially the two vectors of block boundaries mentioned above as second/third args.

Best Answer

Related Solutions

MATLAB: How to assemble matrices

MATLAB: Can you index matrices

Related Question