Passive electrical spread, also called electrotonic spread or electrotonic conduction, is a term used to describe the spread of electrical signals in the absence of voltage-gated currents or other voltage-dependent changes in membrane resistance. Review assumptions in deriving steady-state solution for membrane voltage in space. This worksheet shows examples of many of these PTC Mathcad basics:Ĭan you duplicate this? PTC Mathcad makes engineering calculations both easy and fun.NPB 100q Module 4: Passive Spread I Passive Spread of Electrical Signals Part I: Introduction Goals Review one-dimensional cable theory and its application to neuronal axons and dendrites. To define or extract an element, type in the name of the vector or matrix and use the left bracket key [ to specify the index. You can use the ORIGIN keyword to set the starting index of a vector or matrix to 1 instead of the default zero. There are more than 50 vector and matrix functions, including determinants, returning the number of rows and columns, eigenvalues and eigenvectors, maximum and minimum values, creating submatrices, and looking up values. Once these vectors and matrices are created, PTC Mathcad provides a number of standard operators, such as dot product, transpose, and extracting rows and columns. Users can create vectors and matrices of data, via inputting files, defining individual elements manually, or using functions to populate elements. The Input/Output tab contains wizards to help you import data, and other import and export functions are available on the Function tabs. Data can be exported as standard text, CSV, and Excel files, as well as picture and audio files. The imported data can be processed as vectors, matrices, and tables, using built-in functions, user-defined functions, and user-defined programs. Import a data file in text, CSV, ASCII, or binary format.If you’re doing math, at some point you’ll have data that you will need to import into PTC Mathcad. The Text Formatting tab allows you to control the font, font size, formatting, colors, bullets, numbers, and justification of your text. For example, p CTRL-G will give you π, and by default PTC Mathcad treats it like the circle constant.ĭocumenting your engineering calculations is one of PTC Mathcad’s strengths, and often you want to “show your math” in reports. Enter the English alphabet character followed by CTRL-G.Select them from the Symbols command on the Math tab or,.PTC Mathcad makes it easy to use uppercase and lowercase Greek letters. If you’re doing math, you’ve got to know Greek. PTC Mathcad will automatically reduce units if you want, and will inform you when you attempt to mix incompatible units, like adding angle degrees to temperature degrees. Complex units, like illuminance, inductance, and radiation dose.Derived units, like area, power, and torque.Simple units for mass, length, temperature, and time.The units provided by PTC Mathcad include: And unlike NASA, you can mix units from various system, in both definition and evaluation PTC Mathcad will figure it out. To apply units to a value, simply multiply the value by the unit you want to use, by typing it in directly or selecting it from the Units drop-down list on the Math tab. (Propulsion engineers were using English units whereas everyone else was on the Metric System.
If you’re familiar with the Mars Climate Orbiter story, you understand why that’s important. PTC Mathcad automatically understands and reconciles units. Even though the acceleration due to gravity g appears as a unit, it’s also available as a constant.Ĭonstants can be typed in directly, using a keyboard shortcut if one exists, or selected from the Constants drop-down list on the Math tab. The physics constants include the speed of light, Planck’s constant, the atomic mass unit, Avogadro’s number, and more. The math constants include pi, e, and infinity (for use in limits and integrals). Rather than having to define standard constants for math and physics, these are provided for you. Let’s dive deeper into your introduction to PTC Mathcad: Constants We discussed documentation, entering math, variables, functions, and plotting. Recently, we covered the Beginner’s Guide to PTC Mathcad.
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