Categorii: Tot - variables

realizată de Janne Ettwig 14 ani în urmă

277

How to build an Experiment

In Eprime, variables must be declared in the user script but initialized in the initialization script, while constants need immediate assignment at declaration and cannot be changed later.

How to build an Experiment

Experiment

Init

  • Initialize necessary global variables you have declared in the User script
  • Mainly for setting up variables or doing logic that remains the same for the rest of the program (e.g. search element positions)
  • Set canvasses that are dim-med in User Script
    Logic that remains the same for the rest of the program
    Set up variables
    Initialize global variables

    User Script

    Eprime allows you to declare, but not initialize (assign values to) variables in the User script. This has to be done in the Init script. Constants however have to be initialized immediately.

    Subroutines

  • Some segments of code might need to be executed at various locations in the program --> make a subroutine
  • A subroutine is a collection of code which can be called at any location in the program.
  • Subroutines should be defined in the beginning of the program (after constants and global variables)
  • Functions

    A function is like a subroutine, but returns a single value of a type you specify

    Global Variables (incl. arrays etc.)

    Variables in E-basic:

  • Declared with the keyword Dim (dimension)
  • Variable name must start with a letter but may contain other alphanumeric characters. If it consists of more words
  • Use CamelCase: thisIsAVeryLongNamedVariable
  • Use underscores: this_is_another_long_named_variable
  • Have to be assigned a datatype

  • Example:

    Dim age as integer

  • age can now be referred to and integer values can be assigned to it:
  • age = 28 (age + age will return 56)

    Other datatypes:


  • Integer Any number between –32,768 and 32,767
  • Long Any number between –2,147,483,648 and 2,147,483,647
  • Double Any real number between:
  • Negative –1.797693134862315E308 <= double <= –4.94066E-324
  • Positive 4.94066E-324 <= double <= 1.797693134862315E308
  • String a string of characters contained within “”
  • For example: “boat” or “experiment”
  • Boolean True or false (e.g. isRaining = true)
  • Currency, Date, Variant, etc.
  • Type declarations

    Type declaration:

    Type Person

    name as String

    age as integer

    gender as String

    End Type

    Now you can declare this type like any other variable and access its contents through the “dot notation”


  • Dim member as Person
  • member.name = “John”
  • member.age = 25
  • member.gender = “male”
  • Constants

  • Constants can only be assigned a value once, which cannot be changed afterwards
  • Constants are always defined at the beginning of the program
  • Convention: constant names are specified in uppercase
  • const NO_OF_PERSONS as integer = 5
  • Note: value is assigned directly at declaration, not afterwards as is the case with variables.

    Script in Procedures

    Do logic specific to blocks and trials

  • Get values of list attributes
  • Set up canvases
  • Draw canvases
  • Do stuff with participant’s responses (play correct/incorrect sound, change color of fixation cross depending on correctness)
  • Keep track of participant scores
  • Trial specific
    randomize

    you can randomize things by dirctly putting it into the code variable = random (min rand no, max rand no) or you can put it in a list and work with c.getAttrib, the plus side when doing this is that it is recorded and you know when what is presented in which trial. Randomisation can be done by putting the list in the ramdom mode. Downside is that it may create a lot of extra trials because every position has to be presented before end of the trial.

    Block specific
    Give feedback to respnses (visual/auditory)
    Keep track of participant scores
    Draw Canvasses
    Set up Canvasses
    Get values of list attributes