In , I introduced SECST ( emantic, omputational, tyled, agged) markup, a more expressive alternative to- and partial superset of- Markdown. Although it does not cover in detail the Markdown compatibility of SECST, you may want to read it first to get a basic grasp of SECST syntax. In this article, I introduce the power of SECST computational markup. The Joy of Using SECST Markup S C S T Readers who know about and will be familiar with computational notebooks based on Markdown. These platforms are primarily focused on data professionals, and they are quite frankly awesome! Jupyter Observable But, what if … You are not a data professional and just want some math in your document and need to ensure the values for formulas are correct! You are a teacher who needs to write a math tutorial. You are a data scientist, but you sometimes need something lighter weight that does not require special hosting or a subscription. Then, you may get joy from SECST's computational capabilities. Basic Computations At their most basic level, SECST computations are no more complex than simple Excel formulas. will render as :value[2 * 2] 4 The result will have code styling (usually in monospace font with a grey background) to indicate to readers the value is computed. However, you can provide as an option, e.g. plaintext will render as 4. :value(plaintext)[2 * 2] SECST also has the full expressive power of Excel and more when it comes to math formulas. Here are all the types of computations available: Algebraic Arithmetic Bitwise Combinatorics Complex Geometry Logical Matrix Probability Relational Set Special Statistics String Trigonometry Unit Utility To be fair, this is just because SECST makes use of the library. But, SECST authors do not need to worry about how to include the functionality. It is just there, so things like this are possible: MathJS renders as 2 * x + 1. :value(plaintext)[derivative('x^2 + x', 'x')] renders as 2 * x ^ 2 + x + 3. :value(plaintext)[simplify('x^2 + x + 3 + x^2')] renders as 9. :value(plaintext)[solve('Math.pow(r,2)',{r:3})}] renders as [[7,8],[19,22]]. :value(plaintext)[multiply([[1,2],[3,4]],[[5,6],[1,1]])] Unit conversions like this are also possible: = :value[2 inch to cm] 5.08 cm = :value[90 km/h to mi/h] 55.92340730136006 mi / h = is meters per hour :value[90 km/h to m/h] 9000 m / h m / h = :value[(1 week + 1 day) to days] 8 days = :value[cos(45 deg)] 0.7071067811865476 = :value[8.314 m^3 Pa / mol / K] 8.314 (m^3 Pa) / (mol K) Advanced Computations You can name values so they can be used in other value expressions.  And, it is possible to have readers edit content for use in formulas. Here is an example that covers both cases: The derivative of :value(#formula literal editable)[x^2 + x]
for :value(#variable literal editable)[x]
is :value[derivative($(#formula),$(#variable))] will render as: The derivative of [ x^2 + x ] for [ x ] is 2 * x + 1 Unless the user modifies the formula to be , in which case the result will be . x^3 + x 3 * x^2 + 1 This is obviously a bit more complex than the unit conversion, so here is the explanation … Value tags provide the user with an edit box when configured as . editable Values can be named using . Above we name the formula to be entered and the variable to solve for . #ids #formula #variable By default, the content between the square braces for a tag is considered to be an expression that can be evaluated. So, in the above, SECST is instructed to treat the content as a . :value[] literal Finally, named variables can be accessed in expressions using the syntax . Hence, the final step above is to evaluate using the formula and variable entered by the reader. :value $(#<variable-name>) derivative Interactive Questions SECST even has the ability to render questions and check answers. :question({type:"number",showanswer:true})[
  :text[What is the :code[sqrt(4)]?]
  :answer[2]
] will render as What is the sqrt(4)? [ ____ ] ✓ If the user enters the wrong answer, the question will be boxed in red and the correct answer will be shown because the attribute is set to . showanswer true What is the sqrt(4)? [ 3 ] ✓ Correct Answer: 2 If you are a teacher, I am sure at some point you have provided the wrong answer in a tutorial. SECST can help avoid this. The tag can take an expression just like the tag. Replace the above question with: :answer :value :question({type:"number",showanswer:true})[
  :text[What is the :code[sqrt(4)]?]
  :answer[sqrt(4)]
] More Info Not yet available, but just days away, are REPLs. See the article, for a preview. I will post a SECST-specific story when it is ready. How To Host A REPL The SECST language and transpiler are currently in ALPHA under an AGPL v3.0 license. There is more to explore at . https://secst.org Be joyful! Make yesterday jealous! I would love your feedback here or on . GitHub Featured Photo by on Bekka Mongeau Pexels

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