# Number of degrees of freedom

**URL:** https://community.freefem.org/t/number-of-degrees-of-freedom/523
**Category:** General Discussion
**Created:** [July 27, 2020, 5:49pm UTC](https://community.freefem.org/t/number-of-degrees-of-freedom/523 "2020-07-27T17:49:42Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)
#### Post date: [July 30, 2020, 2:08pm UTC](https://community.freefem.org/t/number-of-degrees-of-freedom/523/4 "2020-07-30T14:08:29Z")

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just defined VRT and VP1 fespae  
difined you matrix A, B and C with varf, va, vb,vc;  
varf va([u1,u2],[v1,v2]) = … ;  
varf vb(p,[v1,v2]) = …;  
varf vc(p,q) = …;

matrix A = va(VRT,VRT);  
matrix B = vb(VP1,VRT);// warning test function corresponding to row index.  
matrix C = vb(VP1,VP1);

matrix K = [[A,B],[B’,C]];

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