Why Does This Definition of a Piecewise Function Produce a Warning Message?

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MATLAB issues a warning when defining the below piecewise function
syms y(x); y(x) = piecewise(x<1, x+1, 1<=x<2, x-1);
But when I write
y(x) = piecewise(x<1, x+1, (1<=x) & (x<2), x-1);
the warning message disappears. Could someone point to an example where those two ways of defining a piecewise function produce different results? It seems here that they give identical results.


Benjamin Thompson
Benjamin Thompson 2022 年 1 月 31 日
This is just a warning about good programming syntax. Good programming style is to never leave order of operations in doubt, and add parenthesis where needed to clarify order of operations. While a <= b <= c is good mathematical notation, it may no be clear to a compiler or interpreter how the expression must be evaluated.
  3 件のコメント
Benjamin Thompson
Benjamin Thompson 2022 年 2 月 2 日
>> -3 <= -2 < -1
ans =
>> (-3 <= -2) & (-2 < -1)
ans =
Kareem Elgindy
Kareem Elgindy 2022 年 2 月 2 日
Beautiful example!


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