45 lines
No EOL
1.7 KiB
Markdown
45 lines
No EOL
1.7 KiB
Markdown
**MatRepl**
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* is a Matrix
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* and a repl: Read–Eval–Print Loop, where Print is doing operations on vectors and matrices in a graphic environment
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* written in vanilla javascript (ES6)
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The repl has the following syntax (It's work in progress, new capabilities will be added)
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* arithmetic expressions:
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* add, subtract, divide, multiply
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* variable declaration eg: a= ...
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* vector(1,2,3,4) adds a vector
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* > > vector@0{x0:1, y0: 2, x:3, y:4}
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* remove(x) removes bindings (when it's an object (eg vector), removes it from the matrix)
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* remove(@x) removes an object using it's assigned index
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* method calls:
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* a = vector(12,1)
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> > vector@0{x0:1, y0: 2, x:12, y:1}
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* a.type()
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> > vector
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* property lookup
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* a.x+1
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> > 13
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* drag vectors using the mouse pointer. You can change the vector arrows visually
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* lazy evaluation. The difference between ```c = a+b``` and ```c = "a+b"```
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is that the latter assigns to c a parsed expression that can always be evaluated later.
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When you apply lazy evaluation and later update ```a```, the value for c will be reevaluated
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automatically. Combined with vector dragging, this way you can get an intuition for vector addition.
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Want to do the same for matrix multiplication and basis change.
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**To run locally**
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* make sure you have node/npm
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* cmdline: npm run start
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* enter the following:
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```
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a = vector(0.5, 0.5)
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b = vector(-1, 1)
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c = "a+b"
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```
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* and press enter. Then using the mouse pointer move a or b. Or try:
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```
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a=2*a
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```
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this updates vector ```a``` to twice it's size. And, because ```c``` is defined lazily, it is updated as well!
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* or type help() |