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Sinus function in graph mode is wrong.

When plotting functions like "sin x", i should get a graph starting at zero, peaking at pi/2, zero at pi, low point in 3pi/2 and zero again at 2pi. (Wave going up, down, up) Instead its behaving like the function "-sin x" doing the opposite. (Wave going down, up, down). Does anybody know if this is caused by a setting? Amplitude, phase and ordinary frequency shows correctly, so the only problem is that is behaves as a negative wave instead of a positive.

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What make and model calculator? Can you give us the exact keystrokes you're using?

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1 Answer

Polar rectangular


There is nothing to convert, because if T is a real number so is 40sin(4000T).
40sin(4000T)=40abs(sin(4000T))*sign(sin(4000T))
where abs() is the absolute value of it argument, and sign(sin(4000T)) is positive or negative.
So in (radius, angle) polar coordinates
r= 40 abs(sin(4000T)),
theta =(0, or PI), depending on sign(sin(4000T))

If you are trying to graph parametric functions, this calculator does not do graphs, and you need another function of T

Dec 26, 2013 | Casio FX991ES Scientific Calculator

1 Answer

So on my graphing calculator i put my equation x^3-x^2-10x-8. then i hit graph and it says err:invalid DIM.


INVALID DIM error message may occur if you are trying to graph a function that does not involve the stat plot features. The error can be corrected by turning off the stat plots. To turn the stat plots off, press 2nd then stat plot, and then select 4:PlotsOff. By the way it is easy to graphing function y=x^3-x^2-10x-8.
See captured images: full graph and detail of the left side max


3_4_2012_7_04_47_am.jpg

3_4_2012_7_07_14_am.jpg

As you can see this function have zero values in the points -2, -1 and 4

Mar 04, 2012 | Texas Instruments TI-84 Plus Silver...

1 Answer

How to draw a trig function (y=sin(theta)) on a Casio 9750 gii


The variable theta is reserved for polar plots. So if you want to graph functions of the form y= expression, you must use the default variable x. Thus draw y=sin(X). Make sure your calculator is configured with the correct angle unit (degree or radian).
If you use degrees the window dimensions for x must cover an interval of 360 degrees, to have a full period. If angle unit is radian, then choose an x-interval between [-pi and pi] or between [0 and 2pi]

Sep 18, 2011 | Casio FX-9750GPlus Calculator

1 Answer

Hi, I'm trying to graph Y= sin(x) and Y=0.5x at the same time. I know that the 0.5x graph is supposed to look like a line going through the origin diagonally but when I press "ZoomTrig" to get...


Set Zoom to Standard Zoom Std or arrange windows limit as follows
Ymin=-1.2
Ymax=1.2
As to Xmin and Xmax it depends on the angle unit. It would be best for you to use Radians. In that case you can set Xmin=-Pi and Xmax=Pi.

If you are using degrees as angle unit, you must set Xmin=-180 and Xmax=180 to get the sine but you will not be able to see much of the 0.5X function because it will shoot out off the graph.

My unsollicited advice is to use the radian as unit

Feb 21, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

I keep trying to graph a linear equation, but when i push graph it says "err:invalid dim" and i have tried making my zoom different but that still doesnt work. whats wrong?


You're trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

Oct 31, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

How to plot a graph on TI-83 plus texas calculator?


Prepare calculator to graph

Turn StatPlotsOff to avoid errors:
Press [2nd][STATPLOT][4:PlotsOff][ENTER].

8e1f66f.jpg
Setup Graph type
  • Press [MODE] key.
  • In Mode set up screen, make sure that the angle unit is the degree.
  • Use the arrows to move cursor to 3rd line to highlight {degree} and press [ENTER]
  • On same screen, verify that Func is highlighted.
  • If it is not, use arrow to highlight Func and press [ENTER] to validate.
  • Do not worry if you do not have exactly the same screen as in the screen picture (We may have different OS Versions)
142a378.jpg

Entering the functions to draw.
  • Press [Y=] to enter function editor.
  • Type in a function
  • Press [ENTER] at the end of each function.
  • Before pressing [GRAPH], make sure that all the = signs that define the functions to be graphed are highlighted white on black. If one is not highlighted, use arrow to move cursor on the sign and press [ENTER].
  • In the screen capture 4 functions are slated to be drawn.
3301a18.jpg

Selecting the Graph Style (You may ignore this now, because it is unimportant for just one graph)

  • Select the graph style: The small piece of line to the left of a Y that defines a function is the style.
  • Move cursor on it and press [ENTER] .
  • Each [ENTER] (on same line) selects another style.
  • On the next screen you have all the styles available on the calculator.
  • Do not select the bubble on line 6: It is for animations. It will not leave a trace at the end of the plot.
7ed82f0.jpg

Drawing the Graphs
  • Press [GRAPH] to see the graphs.
  • If one of them is missing, verify that its = is still highlighted, then use the [WINDOW] to set the Window dimensions,
  • Here are the dimensions of the standard window
5c26e6c.jpg

ZOOMING
You can also press [ZOOM] to adjust.

91c4f6f.jpg

The selection 6:ZStandard sets the dimensions as on the screen Titled Window (above).

In the window screen you can set Xmin=-180, Xmax=180, Xscl=10, Ymin= -0.6, Ymax= 1.5, Yscl=1. The minus here is the change sign (-) to the right of the [.] dot.

Mar 12, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I would like to input a graphing range with a restriced domain. For example SIN X with a RANGE -2pi to 2pi you see that, 4 half curves. Now I would like to see the same SIN X plotted in a Minus ONE to ONE...


I am enclosing a link to a web page that gives you the definition of the domain of a function and its range. You should read it to correct the confusion you entertain between domain and range.
In what follows I will speak of X and Y values.
Let me restate what I think you wanted to do. Ignore my rambling if you do not recognize your intention.

You want to draw the sin(X) function for X varying from Xmin= -2*pi radians to Xmax=2*pi radians. However, it you do not specify the Ymin and Ymax values for the vertical window dimensions a big portion of the screen is not used (vertically) and you want the height of the curve to take most of the screen. Specifically you want to set the vertical height of the window to go from Ymin=-1 to Ymax=1.

Press [SHIFT] [F3:V-Window] to set window dimensions.
On line Xmin= type : (-)2*[SHIFT][EXP] (Pi); or just (-) 6.3
Press [EXE] to validate the choice
On line Xmax= type 2*[SHIFT][EXP] (Pi) or just 6.3
Use down arrow to highlight the line Ymin= and enter (-)1
On line Ymax= type 1

You may or may not want to change the X(scale) and the Y(scale)
Press [EXIT] to exit the window settings.
Draw your graph.It will occupy all the screen.

Here is what you will get.

362fd1e.jpg


Feb 24, 2010 | Casio CFX-9850G Plus Calculator

1 Answer

How do you plot -0.5+sin(x-0.25PI)


Hi,
  1. First clean the calculator configuration to prevent errors. Press [2nd][STATPLOT][4:PlotsOff][ENTER]. Calculator displays Done.
  2. Press [Y=] to open the function editor.
  3. On line Y1= type in the expression
[SIN] [X,T,theta,n] - [2nd] [PI] /4 [)] - 1/2 [ENTER].
If you do not like PI/4 replace it with 0.25 * PI. If you do not like 1/2 use 0.5. It does not make any difference to the calculator.

d0c2dea.jpg
This is what you get.
2fdee22.jpg
Since the sine function varies between -1 and 1, no need to have the window Y values too large. Change the Window dimensions.

b03ee4f.jpg
Here is what you get now.

79eb0db.jpg
Do not worry if you do not see the labels x and y, one has to configure the calculator to show them. This should not be your concern right now.

Hope it helps.

Nov 10, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

I am getting the wrong answers with the tan -1 function


Hello,
That habit of TI, Casio, and Sharp to label the inverse trigonometric functions with the -1 superscript can cause confusions.
  1. The inverse trigonometric functions arcosine, arcsine, and arctangent (labeled by manufacturers as cos^-1, sin^-1, and tan^-1) should not be confused with the other trigonometric functions known as secant(x) =1/cos(x), cosecant(x)=1/sin(x) and cotangent(x) = 1/tan(x).
  2. To avoid errors in the use of the inverse trigonometric functions, one must be careful and set the angle unit to the one required by the problem at hand (degrees, or radians)
  3. To make the trigonometric functions really functions, their range is restricted.
  4. In this calculator arcosine (x) gives results between 0 and 180 degrees (if angle MODE is Degree) or between 0 and Pi radians (if angle MODE is Radian).
  5. The range of results for arcsine(x) and arctangent(x) is between -90 degrees and +90 degrees (if angle MODE Degree) or -Pi/2 and Pi/2 (if angle MODE is Radian)
With this information you should be able to set the angle unit correctly ([MODE][Radian] or [MODE][Degree] ) and interpret the results. If you want to extend the angle to other values, use the periodicity of the trigonometric functions.

Hope it helps

Nov 06, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

If i want to plot the graph on cy calculater,suddenly undefined error used to apper .how to fixed thin problem


Hello,
Clear all ram
[2nd][MEM][7:Reset][1:All Ram].

To enter a function to graph ex: Y1=sin(x)
Press function key [Y=].
On first line where i says Y1= , enter the function [SIN][X,T,theta,n][)][ENTER]
Then press [GRAPH]
If graph is too flat adjust the window by pressing [WINDOW] and hoose different values for Xmin, Xmax, Ymin,Ymax.

Hope it helps.

Aug 22, 2009 | Texas Instruments TI-83 Plus Calculator

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