This command joins NCMatrices horizontally.
i1 : A = QQ{a,b,c,d}
o1 = A
o1 : NCPolynomialRing
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i2 : M = ncMatrix {{a,b,c,d},{b,c,d,a}}
o2 = | a b c d |
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| b c d a |
o2 : NCMatrix
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i3 : N = M | 2*M | -3*M
o3 = | a b c d 2a 2b 2c 2d -3a -3b -3c -3d |
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| b c d a 2b 2c 2d 2a -3b -3c -3d -3a |
o3 : NCMatrix
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