6 December 2023 2:44:14.723 PM PROBLEM4: Fortran77 version A test problem for FD1D_HEAT_STEADY. A heat source and a heat sink. FD1D_HEAT_STEADY Fortran77 version Finite difference solution of the steady 1D heat equation - d/dx ( k(x) dUdx ) = F(x) for space interval A <= X <= B with boundary conditions U(A) = UA U(B) = UB A second order difference approximation is used. X data written to "problem4_nodes.txt". U data written to "problem4_values.txt". PROBLEM4: Normal end of execution. 6 December 2023 2:44:14.723 PM