Reassignation (:=) of a set element fails

[imendez]

Hi, this code returns an error message:

Set f = 4, 3?;
Real f[1] := 2;

However, it works fine with brackets:

Set f = 4, 3?;
Real (f[1] := 2);

Regards.

[Víctor de Buen Remiro]

Thanks to report

[Víctor de Buen Remiro]

Syntax Tol works in this way and is nothing wrong in my opinion. Data types (Real, Serie, ...) are monary operators with the highest precedence. I don't know if this is a good design or not, but it is the only one we have.

System returns an error that helps you to understand what is wrong and, as you have written, you can broke precedence rules using parenthesis.

Then, where is the problem?

[imendez]

Hello Víctor, I could understand that I had to put the brackets around the element I want to modify:

Set f = 4, 3?;
Real (f[1]) := 2;

But not around the whole expression... In previous versions of TOL, as you know, it was necessary. For example, this code didn't work time ago:

Real a = 4;
Real a := 4; This line used to return an error
Real (a := 4); This line used to work right

You ask me what the problem is. The problem is tha, with the error message returned, a TOL new user couldn't never be able to write the code in a right way...

The error message is:

ERROR: [1] Número de argumentos insuficientes para Element (ó [ ] )

How could a novice user of TOL discover the solution?

If it's a syntactic problem and you think it mustn't be solved, all right, but at least I think that this example should be added to description of PutValue (:=).

Thanks.

[Víctor de Buen Remiro]

I will treat to do something to enhance the behaviour in this situations but syntax questions are commonly difficult to solve without collateral effects.

[Víctor de Buen Remiro]

Sorry, I did not read the stupid message

ERROR: [1] Número de argumentos insuficientes para Element (ó [ ] )

This is a surprising message and it has allowed to me to debug the problem and it's already solved in HEAD and 1.1.5

A test has been added at

​http://cvs.tol-project.org/viewcvs.cgi/tol_tests/tol/Bugzilla/bug_000481

Thank you very much for your perseverance