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Language peer sets for DEPI:
United States
United States/1957
Designed 1957
1950s languages
Second generation
Early Cold War
Genus Expression oriented
Specialised Languages
Expression oriented
Expression oriented/1957
Expression oriented/United States
Continuous/United States
Simulating/United States
Specialised Languages
Specialised Languages/1957
Specialised Languages/us


Continuous simulation language 

alternate simple view
Country: United States
Designed 1957
Genus: Expression oriented
Sammet category: Specialised Languages

for Differential Equation Pseudo Interpreter

Henry Lesh, Nasa Jet Propulsion Lab, 1957 (On a Burroughs 204)

Early continuous simulation language; highly declarative - coded directly from flowcharts, (hence the "Pseudo")


Related languages
DEPI DEPI 4   Evolution of


  • Lesh, F. H.; and Curl, F. G. (1957) Lesh, F. H.; and Curl, F. G. "DEPI: An Interpretive Digital-Computer Routine Simulating Differential-Analyzer Operations," Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, March 22, 1957
  • Lesh, F. (1958) Lesh, F. "Methods of Simulating a Differential Analyzer on a Digital Computer" DOI Extract: Introduction Extract: Control Word Structure Extract: Programming and Coding for DEPI Extract: Conclusions
          in [ACM] (1958) [ACM] JACM 5(3) July 1958
  • Linebarger, R. N., and Brennan, R. D. (1964) Linebarger, R. N., and Brennan, R. D. "A survey of digital simulation: digital analog simulator programs" pp22-36
          in (1964) Simulation 3(6) December 1964
  • Sansom, Harnett, Warshawsky, (1964) Sansom, Harnett, Warshawsky, "MIDAS - How It Works and How It's Worked" Extract: Introduction
          in [AFIPS JCC 26] (1964) [AFIPS JCC 26] Proceedings of the 1964 Fall Joint Computer Conference FJCC 1964
  • Lubin, John Francis and Teichroew, Daniel (1966) Lubin, John Francis and Teichroew, Daniel "Computer simulation—discussion of the technique and comparison of languages" pp723-741 Abstract
          in [ACM] (1966) [ACM] CACM 9(10) October 1966
  • Chu, Yaohan (1969) Chu, Yaohan "Digital Simulation of Continuous Systems" McGraw Hill NY 1969
          in [ACM] (1966) [ACM] CACM 9(10) October 1966
  • Karayanakis, Nicholas (1993) Karayanakis, Nicholas "Computer-Assisted Simulation of Dynamic Systems with Block Diagram Languages" CRC Press 1993 Extract: About DEPI
          in [ACM] (1966) [ACM] CACM 9(10) October 1966
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