Code:
//Dialog box for input
expr(ex)→ex
expr(lower)→lower
expr(upper)→upper
d(ex,x)→der
exp►list(solve(der=0,x)|x>lower and x<upper,x)→crit
crit→sol
exp►list(solve(getDenom(der)=0,x)|x>lower and x<upper,x)→uncrit
augment(uncrit,crit)→crit
augment({lower,upper},crit)→crit
approx(crit)→crita
SortA crita,crit
SortA sol
newList(0)→test
For i,1,dim(crit)-1
If crit[i]=lower Then //error occurs here
//do stuff
Why does test not return true or false? Thanks!
This usually happens when there are undefined variables in the expressions being compared, so that the expressions don't fully break down into numbers for comparison. You might add a temporarily “Disp crit[i]=lower” just before the If test to see what the calculator is trying to compare. If the displayed expression has variable names or non-fully-evaluated expressions instead of just “true” or “false”, I'd check for variables that aren't getting defined somehow.
I got a the following response
true
false
false
@8=0
ex equals 2sin(x)
lower equals 0
upper equals 2π
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