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-rw-r--r--lib/Data/Packed/Matrix.hs16
1 files changed, 14 insertions, 2 deletions
diff --git a/lib/Data/Packed/Matrix.hs b/lib/Data/Packed/Matrix.hs
index fe8c159..1b67820 100644
--- a/lib/Data/Packed/Matrix.hs
+++ b/lib/Data/Packed/Matrix.hs
@@ -30,7 +30,7 @@ module Data.Packed.Matrix (
30 (@@>), 30 (@@>),
31 asRow, asColumn, 31 asRow, asColumn,
32 fromRows, toRows, fromColumns, toColumns, 32 fromRows, toRows, fromColumns, toColumns,
33 fromBlocks, toBlocks, toBlocksEvery, 33 fromBlocks, diagBlock, toBlocks, toBlocksEvery,
34 repmat, 34 repmat,
35 flipud, fliprl, 35 flipud, fliprl,
36 subMatrix, takeRows, dropRows, takeColumns, dropColumns, 36 subMatrix, takeRows, dropRows, takeColumns, dropColumns,
@@ -156,7 +156,19 @@ adaptBlocks ms = ms' where
156 x = m@@>(0,0) 156 x = m@@>(0,0)
157 g _ _ = error "inconsistent dimensions in fromBlocks" 157 g _ _ = error "inconsistent dimensions in fromBlocks"
158 158
159----------------------------------------------------------- 159
160--------------------------------------------------------------------------------
161
162-- | create a block diagonal matrix
163diagBlock :: (Element t, Num t) => [Matrix t] -> Matrix t
164diagBlock ms = fromBlocks $ zipWith f ms [0..]
165 where
166 f m k = take n $ replicate k z ++ m : repeat z
167 n = length ms
168 z = (1><1) [0]
169
170--------------------------------------------------------------------------------
171
160 172
161-- | Reverse rows 173-- | Reverse rows
162flipud :: Element t => Matrix t -> Matrix t 174flipud :: Element t => Matrix t -> Matrix t