letter as a variable for a function

[GiorgioBurbanelli89]

Every time I add a text the sheet closes when I call that function with text or say for example
f$(number;number;text)
What would be the correct way to allow the text as a variable?
please an example

[sononicola]

This discussion can help you:
#369

[GiorgioBurbanelli89]

@sononicola #def mat$(num$)
f_c,d,num$ = 50MPa
f_v,d,num$ = 5MPa
#end def
mat$(1)
mat$(2)

f_c,d,1
f_c,d,2
f_v,d,1
f_v,d,2

but what I wanted was to place a variable as text
but here I don't understand exactly
I don't understand the variable as text
Could you explain it to understand and review and analyze what you have done, excuse my ignorance on the subject.

[Proektsoftbg]

Can you also post your code please? It is difficult to say otherwise.

[GiorgioBurbanelli89]

#equ

w = 400';'h = 400

#val
'
'

#def coords$(x_i$; y_i$; x_f$; y_f$; r$; texto$)
'Mostrar coordenadas del punto inicial'
''
'texto$'
' ('x_i$/100', 'y_i$/100')'
''
'Mostrar coordenadas del punto final'
''
'P'
' ('x_f$/100', 'y_f$/100')'
''
''

'Dibujar un círculo en los puntos inicial y final'
'<circle cx="'x_i$'" cy="'y_i$'" r="'r$'" style="stroke:black; stroke-width:2; fill:lime; fill-opacity:0.2; stroke-opacity:0.8" />'
'<circle cx="'x_f$'" cy="'y_f$'" r="'r$'" style="stroke:black; stroke-width:2; fill:lime; fill-opacity:0.2; stroke-opacity:0.8" />'

#end def

#def texto$ = point
x_i = 0';'y_i = 0';'x_f = 300';'y_f = 200';'r = 5
coords$(x_i; y_i; x_f; y_f; r; texto$)

I already fixed it, this was what I was trying to do