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"Argument Error" of the Casio 35+

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MmimiN Posted messages 3 Status Membre -  
 lili -
Hello,

Actually, we're entering a new chapter in math specialization "Continuity and Differentiability," so we need to use the graph. So I go into MENU and then GRAPH. I enter my function and click on F6 (draw) but it shows "Argument Error Press: [EXIT]."
I don't know what happened; I don't remember touching anything.
The same thing happens when I go into MENU and then TABLE, following the same procedure.
Please help me ????????
I tried to find the problem by comparing with my friends' devices, but even then, nothing is resolved.
I've seen several questions of this kind, but I didn't understand.

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Réponse 1 / 2
Pierr10 Posted messages 13769 Registration date   Status Modérateur Last intervention   5 807
 
Hello,

You probably used the alpha key to enter the variable x.
Use the key 
x,θ,T
.

--
What is well conceived is clearly stated,
And the words to express it come easily.
(Boileau)
34
MmimiN Posted messages 3 Status Membre 2
 
Hello,
I want to clarify that this was not the case, I was using the F5 key for X. So now I just tried to use ALPHA then X, etc. and it works, I'm not complaining but is that normal?

In any case, thank you very much, you saved me, I really thought it wouldn't work out.
2
Pierr10 Posted messages 13769 Registration date   Status Modérateur Last intervention   5 807 > MmimiN Posted messages 3 Status Membre
 
Good evening,

I don't have a Casio calculator and I'm not very familiar with them. So I'm responding a bit blindly and based on common sense.

I'm a bit surprised that alpha + x works. (Casio must have included a tolerance).

I recommend getting into the habit of using the 
x,θ,T
key for variables.
The letter obtained changes depending on the type of graph created:
x in Cartesian coordinates,
θ in polar coordinates
t for parametric curves.

Also, take a look at this document: http://briand-lyc.spip.ac-rouen.fr/IMG/pdf/200_graph35_.pdf
4