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Can array languages be used as general purpose languages in any practical way? Or are they really only strong as calculators?

• hoosieree 3y ago
  They can be. I know J has libraries for databases, image, audio processing, etc. I've written an assembler in J and translated it to K. The array languages are pretty decent for prototyping machine learning stuff. Often you don't need any libraries at all. Here's a 2-layer perceptron, first in Python+NumPy: import numpy as np X = np.array([[0,0,1], [0,1,1], [1,0,1], [1,1,1]]) y = np.array([[0,1,1,0]]).T np.random.seed(1) w0 = 2*np.random.random((3,4)) - 1 w1 = 2*np.random.random((4,1)) - 1 for j in range(10000): l1 = 1/(1+np.exp(-(X @ w0))) l2 = 1/(1+np.exp(-(l1 @ w1))) l2_error = y - l2 l2_delta = l2_error * l2 * (1 - l2) l1_error = l2_delta @ w1.T l1_delta = l1_error * l1 * (1 - l1) w0 += X.T @ l1_delta w1 += l1.T @ l2_delta print(np.round(l2,3)) [[0.007] [0.991] [0.992] [0.01 ]] And again in J: input =: 4 3 $ 0 0 1 0 1 1 1 0 1 1 1 1 target =: 4 1 $ 0 1 1 0 dot =: +/ .* sig =: {{ %>:^-y }} train =: {{ 'ignore_me w0 w1' =. y l1 =. sig input dot w0 l2 =. sig l1 dot w1 l2_error =. target - l2 l2_delta =. l2_error * l2 * 1 - l2 l1_error =. l2_delta dot |: w1 l1_delta =. l1_error * l1 * 1 - l1 w0 =. w0 + (|:input) dot l1_delta w1 =. w1 + (|:l1) dot l2_delta l2;w0;w1 }} 5j3":0{::train^:10000 {{<:+:?.y$0}} each 1 ; 3 4 ; 4 1 0.009 0.990 0.990 0.011 Here's that assembler (for the Nand2Tetris assembly language) in K. It's intentionally golfed. L:({x^"\r "}'*'"/"\'0:0)^,"" T:(("R",'$!16)!!16),(($`SCREEN`KBD`SP`LCL`ARG`THIS`THAT)!16384,24576,!5),((-1_1_)'L@&i)!{x-!#x}@&i:"("=*'L T,:n!16+!#n:?(({$[("@"=*x)&^`I$1_x;1_x;`]}'L)^!T)^` C:(" "\"D&A D+A A-D D !D D-1 -D D-A D|A D+1 0 A !A A-1 -A A+1 -1 1")!0 2 7 12 13 14 15 19 21 31 42 48 49 50 51 55 58 63 D:$`" "`M`D`MD`A`AM`AD`AMD J:$`" "`GT`EQ`GE`LT`NE`LE`MP B:{,/$(x#2)\y} P:{c:*d:|"="\*j:";"\x;"111",/(B.7,(64*|/"M"=c)+C@"A"/"M"\c;B.3,D??d 1;B.3,J??1_j 1)} `0:({(P;{"0"^-16$,/$2\(`I$1_x)^T@1_x})[2/"@"=*x;x]}'L)@&~i
• jodrellblank 3y ago
  Dyalog APL is the one I'm most familiar with; as well as its array language syntax it has procedural-style keywords for control flow[1] like if/then/else and do/loop and so on. It has OOP class syntax too, and .NET framework bindings for event-driven Windows Forms GUIs and calling C#/.NET DLLs or building APL-based DLLs for other .NET languages. So yes, but you're not writing much array style code to do those parts. As well as being usable for the back end of a webserver. [1] https://help.dyalog.com/latest/#Language/Control%20Structures/while.htm?TocPath=Programming%2520Reference%2520Guide%257CDefined%2520Functions%2520and%2520Operators%257CTraditional%2520Functions%2520and%2520Operators%257CControl%2520Structures%257C_____3 https://help.dyalog.com/latest/#Language/Control%20Structure...
• razetime 3y ago
  array languages are used by several companies for their work. K for example is pretty popular in fintech. Some present companies provide services for array languages as well. https://www.dyalog.com/case-studies/index.htm https://www.dyalog.com/case-studies/index.htm https://github.com/interregna/arraylanguage-companies https://github.com/interregna/arraylanguage-companies