
MathCAD 15.0 erroneously computes some integrals. On the other hand, if the vectors had been assigned values, then both of the above expressions would reduce to the same value, as long as the second expression had been copied and pasted from the 'simplified' result of the former expression, but if the user typed in the second expression, then its value as a specific three-tuple would be computed correctly. Specifically, in a MathCAD document, the expression ( a + b ) × c were not previously provided values in the form of three-tuples of numbers, then this amounted to a vector algebra error, failing to properly apply distributivity of vector cross product over vector addition. MathCAD 13.0 and 14.0 (and probably the earlier versions) had an error with symbolic vector cross product.

MathCAD 11.0, 12.0, 13.0, and 14.0 had faulty implementations of the rref algorithm that frequently miscalculated the reduced row echelon form of complex matrices.

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This allows for simple manipulation of input variables, assumptions, and expressions, which in turn update in real-time. Because the mathematics are core to the program, the math is inherently live, dynamically recalculating as upstream values are altered. The Mathcad interface allows users to combine a variety of different elements (mathematics, descriptive text, and supporting imagery) into the form of a worksheet, which is naturally readable. Its live feature-level integration with Creo Elements/Pro enables Mathcad analytical models to be directly used in driving CAD geometry, and its structural awareness within Windchill allows live calculations to be re-used and re-applied toward multiple design models. It integrates with PTC’s other solutions that aid product development, including Creo Elements/Pro, Windchill, and Creo Elements/View.


Mathcad is part of a broader product development system developed by PTC, and often utilized for the many analytical touch points within the systems engineering processes. Mathcad is oriented around a worksheet, in which equations and expressions are created and manipulated in the same graphical format in which they are presented (WYSIWYG) - as opposed to authoring in plain text, an approach later adopted by other systems such as Mathematica and Maple. Mathcad today includes some of the capabilities of a computer algebra system, but remains oriented towards ease of use and simultaneous documentation of numerical engineering applications. Originally conceived and written by Allen Razdow (of MIT, co-founder of Mathsoft), Mathcad is now owned by PTC and is generally accepted as the first computer application to automatically compute and check consistency of engineering units such as the International System of Units (SI), throughout the entire set of calculations. Mathcad, Parametric Technology Corporation's engineering calculation solution, is used by engineers and scientists in various disciplines – most often those of mechanical, chemical, electrical, and civil engineering. First introduced in 1986 on DOS, it was the first to introduce live editing of typeset mathematical notation, combined with its automatic computations.
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Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations.
