Argument .. isn't numeric in array slice

I'm not sure I understand this error in the context of my code

    map {
        my $mySTR = "sample";
        $myArr[$_][0] = $mySTR;                             
    } 0..$#myArr

Argument "sample" isn't numeric in array slice

error is shown for line
my $mySTR = "sample";
NewtonianBAsked:
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ozoCommented:
What is in @myArr and what are you trying to do?
Did you mean something like
do {
        my $mySTR = "sample";
        $myArr[$_][0] = $mySTR;                            
    } for 0..$#myArr
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NewtonianBAuthor Commented:
well that solved it thanks!
After trying your method I realized its what I was wrapping around the map was causing the disturbance.
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NewtonianBAuthor Commented:
cheers!!!
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