Error: ...initial value in for loop must be numeric or character
...increment of for loop must be numeric
...increment when looping over characters must be an integer
...final value in for loop must have same type as initial
Description
Examples
The error messages related to loops indicate that elements must be numeric, character, or integer.
Initial value
forxfrommyvariableto5whiletruedoprintxenddo;
Error, initial value in for loop must be numeric or character
If the final value is numeric, ensure that the initial value is numeric, for example, 1.
forxto5whiletruedoprintxenddo;
1
2
3
4
5
forxfrommyvariabletocwhiletruedoprintxenddo;
If the final value is a character, ensure that initial value is also a character.
forxfromatocwhiletruedoprintxenddo;
a
b
c
Final value
y≔sqrt20
y:=25
forxtoywhiletruedoprintxenddo;
Error, final value in for loop must be numeric or character
Use the type command to verify whether the value is numeric or character.
typey,'numeric';
false
typey,'character';
Ensure that the final value is numeric or character.
forxto25whiletruedoprintxenddo;
Increment of for loop
forxby2toevalf3whiletruedoprintxenddo;
Error, increment of for loop must be numeric
typesqrt2,'numeric'
typeevalfsqrt2,'numeric'
true
Use evalf to evaluate the square root of 2, therefore making the increment numeric.
forxbyevalf2toevalf3whiletruedoprintxenddo;
Increment when looping over characters
forifromaby12toewhiletruedoprintienddo;
Error, increment when looping over characters must be an integer
forifromaby2toewhiletruedoprintienddo;
e
foritogwhiletruedoprintienddo;
Error, final value in for loop must have same type as initial
forito7whiletruedoprintienddo;
6
7
See Also
evalf
for
numeric
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