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Math and Science Solutions for Businesses/Asking for an equation/equation sign for single direction conversion


Hi Mr Patton,

I have a problem that I am facing. Can you enlighten me as to the equation sign or better yet the whole equation for something that goes like this.

I have values x and y and I would like to know the sign/equation for allowing x to bring into y but not the other way around.

Example is I have x% monetary discount and y% credit. I wish to allow x to bring into y but not y back into x.

Is there such a way to express it?

Hi Kelvin,

I'm having a little difficulty in understanding your question. Can you expand your example a little bit? I believe that you want to express a % discount in terms of a % credit but am not sure. I also am not sure why you want it to be one way.  

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Randy Patton


Questions regarding application of mathematical techniques and knowledge of physics and engineering principles to product and services design, optimization, prediction, feasibility and implementation. Examples include sales and product performance projections based on math/physics models in addition to standard regression; practical and cost effective sensor design and component configuration; optimal resource allocation using common tools (eg., MS Office); advanced data analysis techniques and implementation; simulation and "what if" analysis; and innovative applications of remote sensing.


26 years as professional physical scientist and project manager for elite research company providing academic quality basic and applied research for government and defense industry clients (currently retired). Projects I have been involved in include: - Notional sensor performance predictions for detecting underwater phenomena - Designing and testing guidance algorithms for multi-component system - Statistical analysis of ship tracking data and development of anomaly detector - Deployed vibration sensors in Arctic ice floes; analysis of data - Developed and tested ocean optical instrument to measure particles - Field testing of protoype sonar system - Analysis of synthetic aperture radar system data for ocean surface measurements - Redesigned dust shelters for greeters at Burning Man Festival Project management with responsibility for allocation and monitoriing of staff and equipment resources.

“A Numerical Model for Low-Frequency Equatorial Dynamics” (with Mark A. Cane), J. of Phys. Oceanogr., 14, No. 12, pp. 18531863, December 1984.

MIT, MS Physical Oceanography, 1981 UC Berkeley, BS Applied Math, 1976

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