condest.m: Overhaul function. Change algorithm to compute inverse matrix just once and cache result in presistent variable. * condest.m: Add more calling forms to documentation (they were always there but not shown explicitly). Rename "apply" to "Afcn" for clarity. Rename "solvefun" to "Ainvfcn" for clarity. Capitalize @var{A} in documentation. Correct documentation about what Ainvfcn must return. Add @seealso link to rcond. Remove "Author:", "Keywords:", "Version:" comments. Rename "have_apply_normest1" to "have_Afcn" for clarity. Rename "have_solve_normest1" to "have_Ainvfcn" for clarity. Rename BIST functions apply_fun, solve_fun to "__Afcn__" and "__Ainvfcn__" with internal prefix so they do not clash with other functions. Update BIST tests for new names. * condest.m (inv_sparse_fcn): Rename from "solve_sparse". Create persistent variables Ainv, Ainvt, n, isreal_op. Add case "init" to switch statement to initialize persistent variables just once per session. Add case "clear" to switch statement to clear persistent variables from memory. * condest.m (inv_full_fcn): Rename from "solve_not_sparse". Create persistent variables Ainv, Ainvt, n, isreal_op. Add case "init" to switch statement to initialize persistent variables just once per session. Add case "clear" to switch statement to clear persistent variables from memory.

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[*.{am,mk}]
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