#N canvas 0 0 632 589 10;
#X obj 53 72 cv/#SVD;
#X obj 70 94 display;
#X obj 53 156 display;
#X msg 53 53 2 2 f # 30 40 50 60;
#X text 53 33 numbers coming from the equation of an ellipse;
#X text 101 75 eigenvectors show the direction of axes of the ellipse
;
#X text 63 137 eigenvalues show the square of the length of the axes
;
#X obj 23 204 #extract_diagonal;
#X obj 36 228 display;
#X obj 24 329 display;
#X text 99 308 just the radiuses;
#X obj 23 309 # sqrt (f #);
#X obj 0 0 doc_h;
#X obj 3 358 doc_c 0;
#X obj 3 398 doc_i 1;
#X obj 3 460 doc_o 1;
#X obj 14 490 doc_oo 0;
#X obj 14 428 doc_ii 0;
#X obj 0 555 doc_f;
#X obj 97 428 doc_m i0 grid;
#X obj 97 490 doc_m o0 grid;
#X text 130 203 just keep the main diagonal of the matrix;
#X msg 449 169 3 3 # 1 2 3 4 5 6 7 8 9;
#X obj 449 188 # +;
#X text 474 186 cast to grid;
#X obj 449 207 #extract_diagonal;
#X obj 456 228 display;
#X text 232 428 a Dim(N \, N) grid \, that is \, a square matrix;
#X obj 3 535 doc_also;
#X obj 103 535 cv/#SVD;
#X obj 36 257 #fold +;
#X obj 36 278 display;
#X text 85 257 this is the Trace of the matrix (sum over main diagonal)
;
#X text 232 490 a Dim(N) grid \, the diagonal vector : at position
(i) in this grid \, there is element (i \, i) of the input grid.;
#X obj 449 249 #fold +;
#X text 465 148 SIMPLER EXAMPLE :;
#X obj 449 268 display;
#X text 497 249 the Trace;
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#X connect 0 1 1 0;
#X connect 3 0 0 0;
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