expression-eval | JavaScript expression parsing and evaluation | Parser library

This is a follow-up on my previous question on dependently-typed arbitrarily-dimensioned matrices.

I have defined a matrix type, where each natural in dims defines the size of the corresponding dimension. For example, for some type A, matrix A [3; 5; 2] is a 3x5x2 matrix:

I recently added

I would like to see continued fractions with integers displayed in that form with SymPy, but I cannot seem to make SymPy comply. I found this Stack Overflow question and answer very useful (see farther below), but cannot reach my target goal here:

This is the continued fraction expansion of $\frac{13}{5}$. A common notation for this expansion is to give only the boxed terms as does SymPy below, i.e., $[2,1,1,2]$ from the SymPy continued_fraction_iterator:

I am currently working at this project called "expression evaluator" and I've got some questions about how to code it.

First of all, what does this "expression evaluator" do ? It simply evaluates the expression that you inserted, it must support:

• round parentheses
• operators: +, -, /, *, <>, =, <=, >=, or, and, xor, not, mod, \
• all the mathematical functions from here
• real, integer and logical constant (1, 1.1, -1, true, false, etc..)
• normal variables like var, e.g: 1 + var // the variables can be used like this: "var = 50 1 + var" and it should output 51.

I currently managed to transform the string to postfix notation(Reversed Polish Notation) and to evaluate it, but it currently supports only (+, -, *, /, ^) and only just the real and integer constants.

How could I add support for the rest of the operators/variables/formulas ?

I have actually tried to add support for variables/formulas but it works only for basic expressions, like: pow(1, 3) + 2, this outputs 3 (TRUE). If I try more complex expressions it happens something like: pow(pow(2, 3), 2), this outputs 512 which is wrong, it should output 64.

Here's my code so you can test it yourself.

The question appears in comments of all questions about GroovyShell, like Using GroovyShell as "expression evaluator/engine" (or: How to reuse GroovyShell). Not a surprise, since the design of the API seems it's not covering this topic at all. Unfortunately, this was never discussed explicitly.

The problem in a compact form:

Static initialization:

Similar link Dynamic Expression Evaluation in pandas using pd.eval()

This link talks about df.eval and df.query but does not directly solve this problem.

As my question states, I would like to invoke custom function on run-time to a dataframe. Use of custom function will be to calculate difference between two date (i.e. age), convert year to months, find max-min from two columns etc.

So Far, I succeeded in performing arithmetic operations and few functions like abs(), sqrt() but couldn't get min()-max() working.Things working are,

Does anyone have experience publishing a .NET/Angular project to Netlify? I'm using the Angular Microsoft.AspNetCore.SpaTemplates template. On Netlify, I'm getting a non-zero exit code that's preventing me from publishing. Here is my output:

This Lark parser is based on this question and this website, but it fails when parsing a OR b OR c.

The website suggests: