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I do not know about cocalc, but on sagenb and jupyter you can simply do:

show(A)


Or, if you want to see dots on the nonzero indices:

plot(A)


I do not know about cocalc, but on sagenb and jupyter you can simply do:

show(A)


Or, if you want to see dots on the nonzero indices:

plot(A)


Or, if you want to see the matrix in a pdf file:

view(A)