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61 lines
1.4 KiB
Nim
61 lines
1.4 KiB
Nim
# Test overloading of [] with multiple indices
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type
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TMatrix* = object
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data: seq[float]
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fWidth, fHeight: int
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template `|`(x, y: int): expr = y * m.fWidth + x
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proc createMatrix*(width, height: int): TMatrix =
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result.fWidth = width
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result.fHeight = height
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newSeq(result.data, width*height)
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proc width*(m: TMatrix): int {.inline.} = return m.fWidth
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proc height*(m: TMatrix): int {.inline.} = return m.fHeight
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proc `[,]`*(m: TMatrix, x, y: int): float {.inline.} =
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result = m.data[x|y]
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proc `[,]=`*(m: var TMatrix, x, y: int, val: float) {.inline.} =
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m.data[x|y] = val
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proc `[$ .. $, $ .. $]`*(m: TMatrix, a, b, c, d: int): TMatrix =
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result = createMatrix(b-a+1, d-c+1)
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for x in a..b:
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for y in c..d:
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result[x-a, y-c] = m[x, y]
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proc `[$ .. $, $ .. $]=`*(m: var TMatrix, a, b, c, d: int, val: float) =
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for x in a..b:
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for y in c..d:
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m[x, y] = val
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proc `[$ .. $, $ .. $]=`*(m: var TMatrix, a, b, c, d: int, val: TMatrix) =
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assert val.width == b-a+1
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assert val.height == d-c+1
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for x in a..b:
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for y in c..d:
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m[x, y] = val[x-a, y-c]
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proc `-|`*(m: TMatrix): TMatrix =
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## transposes a matrix
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result = createMatrix(m.height, m.width)
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for x in 0..m.width-1:
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for y in 0..m.height-1: result[y,x] = m[x,y]
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#m.row(0, 2) # select row
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#m.col(0, 89) # select column
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const
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w = 3
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h = 20
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var m = createMatrix(w, h)
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for i in 0..w-1:
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m[i, i] = 1.0
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for i in 0..w-1:
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stdout.write(m[i,i]) #OUT 111
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