Mosaic matrix: Difference between revisions

===Procedural===

===Functional===

No need for nested conditionals here.

<lang python>'''Mosaic grid'''

# mosaic :: Int

def mosaic(n):

'''Grid of alternating ones and zeroes,

starting with one at top left.

'''

return matrix(

n, n,

lambda y, x: (1 + y + x) % 2

)

# ------------------------- TEST -------------------------

# main :: IO ()

def main():

'''Test'''

for n in [7, 8]:

print(

showMatrix(

mosaic(n)

) + '\n'

)

# ----------------------- GENERIC ------------------------

# matrix :: Int -> Int -> ((Int, Int) -> a) -> [[a]]

def matrix(nRows, nCols, f):

'''A matrix of a given number of columns and rows,

in which each value is a given function over the

tuple of its (one-based) row and column indices.

'''

return [

[f(y, x) for x in range(1, 1 + nCols)]

for y in range(1, 1 + nRows)

]

# showMatrix :: [[a]] -> String

def showMatrix(rows):

'''String representation of a matrix'''

return '\n'.join([

' '.join([str(x) for x in y]) for y in rows

])

# MAIN ---

if __name__ == '__main__':

main()</lang>

{{Out}}

<pre>1 0 1 0 1 0 1

0 1 0 1 0 1 0

1 0 1 0 1 0 1

0 1 0 1 0 1 0

1 0 1 0 1 0 1

0 1 0 1 0 1 0

1 0 1 0 1 0 1

1 0 1 0 1 0 1 0

0 1 0 1 0 1 0 1

1 0 1 0 1 0 1 0

0 1 0 1 0 1 0 1

1 0 1 0 1 0 1 0

0 1 0 1 0 1 0 1

1 0 1 0 1 0 1 0

0 1 0 1 0 1 0 1</pre>