Welcome to the fastest graphing calculator on Scratch! This calculator is easy to use and comes equipped with many handy features. Key Features: > Graph up to 3 functions at once > Perform a variety of operations from the basic four to trigonometric > Manipulate the window to view the graph with ease > Trace a function to locate exact points > View a system of tick marks to reveal the scale of the graph Inputting a Function: > Click “See Inside”. In Sprite 1 you should see the block “Define: Load Function”. Under this block there are three if statements assigned a number and containing the block “Set y to:” You can create a function by using the variable “x” and operating on it with any of Scratch’s built in operators. Then place your function in one of the “Set y to:” blocks. (The variables “x^2” and “x^3” are also available for your convenience.) Graphing a Function: To graph the functions that you have input, press the flag or any of the controls that affect the view of the graph (as seen in the next section). Controlling the View of the Graph: W: Shift your view up S: Shift your view down A: Shift your view left D: Shift your view right E: Zoom in Q: Zoom out Up/Down Arrows: Change the scale of the y-axis Right/Left Arrows: Change the scale of the x-axis Note: When the flag is clicked, the default View Window is [-15, 15] by [-11.25, 11.25] Examining a Graph: G: Turn tick marks on and off T: Turn trace on and off While trace is on: Z: Move tracer left X: Move tracer right C: Allows you to enter an x-value for the tracer
Ways to prevent lag: > Turn off trace when not in use > Graph one function at a time > Turn off tick marks > Do not zoom in or out to extremes “FAQs” Q: Why does the graph of sqrt(x) + 1 show negative x-values as 1? A: Due to the way Scratch handles undefined values, incorrect lines/marks may end up on the graph. Q: Why does part of the graph not appear when I zoom out or change the scale of the axis? A: Very steep lines or curves may not fully appear on the graph. To fix this, find the variable “pitch change” in the program, move the slider to the right, and then graph. However, this will cause lag. Q: Why don’t the graphs of the trigonometric functions look right? A: Since Scratch uses degrees instead of radians, the least positive x-value for which y=1 in the graph of (sin x) is 90. The scale of the graph needs to be changed. Hold the left arrow until you see the graph take shape. Q: Why don’t you make it so that a function can be typed in instead of having to manipulate the code? A: I may implement this in the future, but this system requires a lot of work and is less efficient when it comes to graphing the function. Change Log: v1.0: 11/24/15: Initial Release
