Some aspects of programation
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where A an B are matrices and a, b, c d are integers. | where A an B are matrices and a, b, c d are integers. | ||
| − | + | ||
'''noalias'''(A) = B. | '''noalias'''(A) = B. | ||
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Other operation that we can do is to size a matrix. The best way is for exemple: | Other operation that we can do is to size a matrix. The best way is for exemple: | ||
| − | if A. | + | if( A.size1()!=3 || A.size2()!=3) |
| − | + | A.resize( 3,3,false) | |
| − | + | ||
| − | resize( 3,3,false) | + | |
| Line 39: | Line 37: | ||
for exemple | for exemple | ||
| − | noalias(A)= | + | noalias(A)=ZeroVector(3) |
| − | noalias(A)= | + | noalias(A)=ZeroMatrix(4,4) |
There are too many oparations that we can do. | There are too many oparations that we can do. | ||
Revision as of 13:01, 10 September 2008
Begin to understand a code is sometimes a headache. However, we will settle for only understand the mathematical key aspects.
In Kratos many mathematical operations and operations with variable use the library UBLAS.
for exemple, if i want to this operation or another operation:
A[a,b]=B[c][d].
X+=Y.
where A an B are matrices and a, b, c d are integers.
noalias(A) = B.
noalias(X) += Y.
noalias(Y) = prod(A,x).
noalias(Y) = prod(trans(A),x).
prod: Matrix Products trans:Transposed a matrix
Other operation that we can do is to size a matrix. The best way is for exemple:
if( A.size1()!=3 || A.size2()!=3)
A.resize( 3,3,false)
where A can be a matrix or a vector.
We can initialize with a null matrix or vector
for exemple
noalias(A)=ZeroVector(3)
noalias(A)=ZeroMatrix(4,4)
There are too many oparations that we can do. If you want to learn more visit the page
http://www.boost.org/doc/libs/1_35_0/libs/numeric/ublas/doc/index.htm
here are the most importants operations that you will use in Kratos.
Don't forget to type noalias in the left of the opertions.
