Hello,

can you explain me the syntax for a function with subscript please.



Regards, Felted

Hello,

I think that the definition of a function with the function arguments in the subscript of the function name is not possible. Actually, do not see the reason for that. I hope I am right.

Regards,
Radovan

For me its not even possible to have a subscripted function. When I type dot then open parenthesis the paren shifts to normal text not subscript. But be careful, if you look at the SMath file the dot is there but not visible on the screen. In otherwords if I type "f.(x)", the function name is "f.".

But if you type f.x(x)=x^2 the function name is f.x (f subscript x) and f.x(2)=4.

Hm, but here http://en.smath.info/forum/default.aspx?g=posts&m=2883#post2883 smath wrote:

Quote

Subscript for variables, functions and units implemented...

Therefore I think, it sould be possible to use it.
The question ist, how?

Regards, Felted

Hello Felted,

Wrote

Hm, but here http://en.smath.info/forum/default.aspx?g=posts&m=2883#post2883 smath wrote:

Quote

Subscript for variables, functions and units implemented...

Therefore I think, it sould be possible to use it.
The question ist, how?

I think you did not understand what Ed mentioned in its post, or we do not know what you are interested in, sorry.
On the thread you mentioned, subscripts are regarded as literal index i.e. part of the variable, function, unit name. That means that if you define a variable, function or unit you can use period in its name. After the period the folowing part of the name will be visible as subcript. When you use them you must also type the period because this is a part of their name.
Type: ABC.abc:abc
See:
[MATH=eng]ABC.abc←10[/MATH]
Type: Fun.xy(x,y):x^2[SPACE]+y^2
See:
[MATH=eng]Fun.xy(x,y)←x^2+y^2[/MATH]

It is quite different than the index of an indexed variable (vector, matrix)- here are few examples (here the integers as subscript -index represent the apropriate vector elements.)
[MATH=eng]x.abc←mat(2,6,8,3,1)[/MATH]
To see the second element in the vector you should type:
Type: x.abc[2=
See:
[MATH=eng]el(x.abc,2)=6[/MATH]
More examples:
[MATH=eng]Fun.xy(x)←mat(x,x^2,x^3,3,1)[/MATH]
[MATH=eng]el(Fun.xy(2),3)=8[/MATH]

By the way, my students often mix up those two different subscripts.

Regards,
Radovan

Typically I thing of a function as taking a value so I was curious what would happen if it took a matrix. See below.



Don't forget the xy subscript is just part of the name. Type Fun.xy. The element is accessed by the [ key. In the first case it was Fun.xy(a[2,2) and the second case Fun.xy(a)[2,2.

Have Fun.