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arrayops.jl
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/
arrayops.jl
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#Array test
## basics
a = ones(4)
b = a+a
@assert b[1]==2. && b[2]==2. && b[3]==2. && b[4]==2.
@assert length((1,)) == 1
@assert length((1,2)) == 2
@assert isequal(1+[1,2,3], [2,3,4])
@assert isequal([1,2,3]+1, [2,3,4])
@assert isequal(1-[1,2,3], [0,-1,-2])
@assert isequal([1,2,3]-1, [0,1,2])
@assert isequal(5*[1,2,3], [5,10,15])
@assert isequal([1,2,3]*5, [5,10,15])
@assert isequal(1/[1,2,5], [1.0,0.5,0.2])
@assert isequal([1,2,3]/5, [0.2,0.4,0.6])
a = ones(2,2)
a[1,1] = 1
a[1,2] = 2
a[2,1] = 3
a[2,2] = 4
b = a'
assert(a[1,1] == 1. && a[1,2] == 2. &&
a[2,1] == 3. && a[2,2] == 4.)
assert(b[1,1] == 1. && b[2,1] == 2. &&
b[1,2] == 3. && b[2,2] == 4.)
a = Array(Float64, 2, 2, 2, 2, 2)
a[1,1,1,1,1] = 10
a[1,2,1,1,2] = 20
a[1,1,2,2,1] = 30
@assert a[1,1,1,1,1] == 10
@assert a[1,2,1,1,2] == 20
@assert a[1,1,2,2,1] == 30
b = reshape(a, (32,))
@assert b[1] == 10
@assert b[19] == 20
@assert b[13] == 30
b = rand(32)
a = reshape(b, (2, 2, 2, 2, 2))
@assert ndims(a) == 5
@assert a[2,1,2,2,1] == b[14]
@assert a[2,2,2,2,2] == b[end]
sz = (5,8,7)
A = reshape(1:prod(sz),sz...)
tmp = A[1:3,2,2:4]
@assert tmp == cat(3,46:48,86:88,126:128)
tmp = A[:,7:-3:1,5]
@assert tmp == [191 176 161; 192 177 162; 193 178 163; 194 179 164; 195 180 165]
tmp = A[:,3:9]
@assert tmp == reshape(11:45,5,7)
rng = (2,2:3,2:2:5)
tmp = zeros(Int,map(max,rng)...)
tmp[rng...] = A[rng...]
@assert tmp == cat(3,zeros(Int,2,3),[0 0 0; 0 47 52],zeros(Int,2,3),[0 0 0; 0 127 132])
## arrays as dequeues
l = {1,2,3}
push(l,8)
@assert l[1]==1 && l[2]==2 && l[3]==3 && l[4]==8
v = pop(l)
@assert v == 8
v = pop(l)
@assert v == 3
@assert length(l)==2
# concatenation
@assert isequal([ones(2,2) 2*ones(2,1)], [1 1 2; 1 1 2])
@assert isequal([ones(2,2), 2*ones(1,2)], [1 1; 1 1; 2 2])
# "end"
X = [ i+2j for i=1:5, j=1:5 ]
@assert X[end,end] == 15
@assert X[end] == 15 # linear index
@assert X[2, end] == 12
@assert X[end, 2] == 9
@assert X[end-1,2] == 8
Y = [2, 1, 4, 3]
@assert X[Y[end],1] == 5
@assert X[end,Y[end]] == 11
## find, findfirst ##
a = [0,1,2,3,0,1,2,3]
@assert find(a) == [2,3,4,6,7,8]
@assert find(a.==2) == [3,7]
@assert find(isodd,a) == [2,4,6,8]
@assert findfirst(a) == 2
@assert findfirst(a.==0) == 1
@assert findfirst(a.==5) == 0
@assert findfirst([1,2,4,1,2,3,4], 3) == 6
@assert findfirst(isodd, [2,4,6,3,9,2,0]) == 4
@assert findfirst(isodd, [2,4,6,2,0]) == 0
## findn ##
b = findn(ones(2,2,2,2))
@assert (length(b[1]) == 16)
@assert (length(b[2]) == 16)
@assert (length(b[3]) == 16)
@assert (length(b[4]) == 16)
#hand made case
a = ([2,1,2],[1,2,2],[2,2,2])
z = zeros(2,2,2)
for i = 1:3
z[a[1][i],a[2][i],a[3][i]] = 10
end
@assert isequal(a,findn(z))
## permute ##
#keeps the num of dim
p = randperm(5)
q = randperm(5)
a = rand(p...)
b = permute(a,q)
@assert isequal(size(b), tuple(p[q]...))
#hand made case
y = zeros(1,2,3)
for i = 1:6
y[i]=i
end
z = zeros(3,1,2)
for i = 1:3
z[i] = i*2-1
z[i+3] = i*2
end
#permutes correctly
@assert isequal(z,permute(y,(3,1,2)))
## ipermute ##
tensors = {rand(1,2,3,4),rand(2,2,2,2),rand(5,6,5,6),rand(1,1,1,1)}
for i = tensors
perm = randperm(4)
@assert isequal(i,ipermute(permute(i,perm),perm))
@assert isequal(i,permute(ipermute(i,perm),perm))
end
## reduce ##
z = zeros(2,2,2,2)
for i=1:16
z[i] = i
end
@assert sum(z) == sum(z,(1,2,3,4))[1] == 136
v = cell(2,2,1,1)
v[1,1,1,1] = 28.0
v[1,2,1,1] = 36.0
v[2,1,1,1] = 32.0
v[2,2,1,1] = 40.0
@assert isequal(v,sum(z,(3,4)))
## large matrices transpose ##
for i = 1 : 5
a = rand(200, 300)
@assert isequal(a', permute(a, (2, 1)))
end
## basic darray ##
d = drand(10,10)
@assert isequal(d'', d)
@assert isequal(convert(Array,d), d)
## cumsum
begin
local A, A1, A2, A3
A = ones(Int,2,3,4)
A1 = reshape(repmat([1,2],1,12),2,3,4)
A2 = reshape(repmat([1 2 3],2,4),2,3,4)
A3 = reshape(repmat([1 2 3 4],6,1),2,3,4)
@assert isequal(cumsum(A),A1)
@assert isequal(cumsum(A,1),A1)
@assert isequal(cumsum(A,2),A2)
@assert isequal(cumsum(A,3),A3)
end