mtx_conv: one or two dimensional convolution for matrices. help-patch

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svn path=/trunk/externals/iem/iemmatrix/; revision=5717

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diff --git a/doc/mtx_conv-help.pd b/doc/mtx_conv-help.pd
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+#N canvas 166 141 740 545 10;
+#X text 458 17 updated for;
+#X obj 546 17 iemmatrix 0.2;
+#X obj 595 43 matrix;
+#X text 465 42 see also help for;
+#X text 90 15 [mtx_conv];
+#X text 47 34 2-dimensional convolution;
+#X text 18 63 you can calculate the convolution of a matrix with a
+filter matrix kernel (2 dimensional FIR filtering). Of course \, it
+can also be used for 1-dimensional FIR convolutions.;
+#X obj 63 196 matrix 1 10;
+#X msg 64 176 element 1 1 1;
+#X msg 42 127 bang;
+#X obj 42 151 t b b b;
+#X obj 64 215 t a a;
+#X obj 94 248 mtx_print orig;
+#X obj 64 274 mtx_conv;
+#X obj 173 197 t a a;
+#X obj 200 217 mtx_print filter_kernel;
+#X obj 64 304 mtx_print result;
+#X msg 173 174 matrix 2 2 1 1 1 1;
+#X connect 7 0 11 0;
+#X connect 8 0 7 0;
+#X connect 9 0 10 0;
+#X connect 10 0 7 0;
+#X connect 10 1 8 0;
+#X connect 10 2 17 0;
+#X connect 11 0 13 0;
+#X connect 11 1 12 0;
+#X connect 13 0 16 0;
+#X connect 14 0 13 1;
+#X connect 14 1 15 0;
+#X connect 17 0 14 0;