![]() ![]() When you compare strings, the string expressions are evaluated based on their alphabetical sort order, which depends on the Option Compare setting. ![]() ![]() For more information, see Troubleshooting Data Types. This could lead to unexpected results from certain operations, such as value comparison and the Mod Operator. When you work with floating-point numbers, keep in mind that they do not always have a precise representation in memory. It is safer to test whether the absolute value of the difference between the two numbers is less than a small acceptable tolerance. For this reason, you should take care when using equality ( =) to compare two floating-point variables. Such fractional value loss may cause two values to compare as equal when they are not. For Decimal expressions, any fractional value less than 1E-28 might be lost. Similarly, when you compare an expression of type Decimal to an expression of type Single or Double, the Decimal expression is converted to Single or Double. This behavior is opposite to the behavior found in Visual Basic 6. When you compare an expression of type Single to one of type Double, the Single expression is converted to Double. The Is operator, the IsNot operator, and the Like operator have specific comparison functionalities that differ from the operators in the preceding table. The = Operator is also used as an assignment operator. The following table contains a list of the relational comparison operators and the conditions that determine whether result is True or False. Any String expression or range of characters. A Boolean value representing the result of the comparison. Syntax result = expression1 comparisonoperator expression2 The relational comparison operators are discussed in detail on this page. Is, IsNot, and Like are discussed in detail on separate Help pages. These operators compare two expressions to determine whether or not they are equal, and if not, how they differ. More- over, all of its basic functions can be accessed by the non-programmer user through a graphic user interface (GUI) that requires no experience with computer programming.The following are the comparison operators defined in Visual Basic. Of the various experiment-building sys- tems currently available, both on the Macintosh and the IBM-PC (Schneider, 1988), PsyScope is one of the most complete and powerful (Cohen et al., 1993). Many researchers have developed systems for laboratory timing and stim- ulus presentation using this computer (Chute, 1986 Bharucha et al., 1987 Westall et al., 1989 Rensink, 1990 Enns and Rensink, 1991 Busey, 1992 Doenias et al., 1992 Goolkasian, 1993 Haxby et al., 1993). DESCRIPTION PsyScope is a system for building behavioral experiments on the Apple Macintosh computer. A freeware version is available at the author's web site. The program supports a wide variety of experimental designs, multimedia formats, and stimulus control. The PsyScope experiment-building system BRIAN MACWHINNEY,* JONATHAN COHEN and JEFFERSON PROVOST Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA Received 25 July 1996 revised 27 March 1997 accepted 27 March 1997 Abstract-PsyScope is a system for building behavioral experiments on the Apple Macintosh computer using a graphic user interface that requires no computer programming. Spatial Vision (continued as Seeing & Perceiving from 2010) Brill More- over, all of its basic functions can be accessed by the non-programmer user through a graphic user interface (GUI) that requires no experience with computer programming. Macwhinney, Brian Provost, Jefferson Cohen, Jonathan The PsyScope experiment-building system The PsyScope experiment-building system ![]()
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