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## Re: Calc; Div by 0 in solving system

 From: Eli Zaretskii Subject: Re: Calc; Div by 0 in solving system Date: Mon, 22 Apr 2019 09:23:04 +0300

```> From: Christopher Howard <address@hidden>
> Date: Sun, 21 Apr 2019 07:37:47 -0800
>
> Place this on stack with algebriac mode:
>
> [2 * x - 3 * y + z = 5, x + y - 2 * z = 0, -x + 2 * y + 3 * z = -3]
>
> run command 'a S x,y,z'
>
> Receive error 'Division by zero: 1'
>
> I enabled Debug on Error but could not find the backtrace

Here's the backtrace, obtained by setting debug-on-message to
"Division by zero":

Debugger entered--Lisp error: "Division by zero: 1."
message("%s%s" "Division by zero: 1." "")
calc-explain-why((* "Division by zero" (float 1 0)) nil)
calc-do-handle-whys()
calc-handle-whys()
calc-enter-result(1 "solv" (calcFunc-solve (vec (calcFunc-eq (+ (- (* 2
(var x var-x)) (* 3 (var y var-y))) (var z var-z)) 5) (calcFunc-eq (- (+ (var x
var-x) (var y var-y)) (* 2 (var z var-z))) 0) (calcFunc-eq (+ (- (* 2 (var y
var-y)) (var x var-x)) (* 3 (var z var-z))) -3)) (vec (var x var-x) (var y
var-y) (var z var-z))))
#f(compiled-function () #<bytecode 0x2000000001d6b378>)()
calc-do(#f(compiled-function () #<bytecode 0x2000000001d6b378>) 102)
calc-solve-for("x,y,z")
funcall-interactively(calc-solve-for "x,y,z")
call-interactively(calc-solve-for nil nil)
command-execute(calc-solve-for)

```