Computer algebra

See this issue sympy/sympy#11044 . That issue was fixed in PR sympy/sympy#11566. Though no test case was added for the lambdify.

What needs to be done?

Add test case that this works just fine:

>>> from sympy import MatrixSymbol, lambdify
>>> x = MatrixSymbol('x', 3, 1)
>>> f = lambdify(x, x.T*x)

Test case needs to

The basics of DiscreteSystem exists now, but the little details around it need to be finished.

Right now we have code like this for "URL" based help viewers:

    HELP_VIEWER_INFO.firefox := rec(
    type := "url",
    show := function(url)
      Exec(Concatenation("firefox \"file://", url,"\" >/dev/null 2>&1 &"));
    end
    );

So clearly the "URL" they get isn't a real URL, it's just a path (plus possibly an anchor, so foo.html#123). This should be refactored: the ca

There's CHANGELOG.md file in the repo's root. It should link to am.angouri.org/whatsnew

Debugging Kotlin∇ code within IntelliJ IDEA can be somewhat cumbersome due to the functional API structure (lots of deeply-nested stack traces and context switching). To facilitate more user-friendly debugging, we should add support for visual debugging by exposing Kaliningraph’s built-in graph visualization capabilities. For example, the use

Someone interested in improving the Symja help/tutorial?

• https://matheclipse.org/

Please improve the markdown documents here:

• https://github.com/axkr/symja_android_library/tree/master/symja_android_library/doc

This is a common pattern: I have a list of independent criteria that a student's answer must fulfil. For each of them, I want to add a certain amount of credit if it's satisfied, and give some negative feedback otherwise.

At the moment, it's possible with this:

if(criterion_satisfied,
  add_credit(amount, "You did it!")
, negative_feedback("You didn't do it.")
)

It would be c

syms a;

unique([a,a]) works fine, but

unique([a])

leads to the following error:
error: Python exception: UnboundLocalError: local variable ‘s’ referenced before assignment
occurred at line 1 of the Python code block:
return sp.Matrix([list(uniq(*ins))]),
error: called from
pycall_sympy_ at line 178 column 7
unique at line 55 column 5

It could be more informative on pypi.org:

The right column must be expanded to roughly match the left one.