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Question: How to draw a graph from this variable?

Question:How to draw a graph from this variable?

matviiv 5 Maple
plotting heaviside incomplete-question
December 10 2023
1


Code:

Graph := NULL; for i from 0 to N-1 do for j from 0 to 10 do if j <= finite_element_xi[i] and finite_element_xi[i] <= j+1 then finite_element_sigma[i] := evalf(finite_element_epsilon[i]*R(j)); p := plot(finite_element_sigma[i](x), x = finite_element_xi[i] .. finite_element_xi[i+1]); Graph := display(Graph, p) end if end do end do;
Error, (in plot) illegal use of an object as a name
I don't understand how to draw a graph for sigma
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