Labeling Y-Axis with Pi and -Pi

  • MHB
  • Thread starter Dustinsfl
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In summary, the conversation was about labeling the y-axis with pi and -pi on a graph created using a TikZpicture. The suggested solution was to add ticks and labels at (0, $\pi$) and (0, $-\pi$) using the code provided in the conversation. The speaker also mentioned a resource for finding examples of similar tasks.
  • #1
Dustinsfl
2,281
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I am trying to label the y-axis with pi and -pi. How can I do that?

Code: 
\begin{tikzpicture}
\draw[->] (0,0) -- (3.5,0) coordinate (x axis);
\draw[->] (0,-3.5) -- (0,3.5) coordinate (y axis);
\end{tikzpicture}
 
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  • #2
dwsmith said:
I am trying to label the y-axis with pi and -pi. How can I do that?
Do you mean to draw ticks and labels at (0, $\pi$) and (0, $-\pi$)? You could do the following.

Code: 
\def\npi{3.1416}
\begin{tikzpicture}
\draw[->] (0,0) -- (3.5,0) node[below] {$x$};
\draw[->] (0,-3.5) -- (0,3.5) node[left] {$y$};
\draw (2pt,\npi) -- (-2pt,\npi) node {$\pi$};
\draw (2pt,-\npi) -- (-2pt,-\npi) node {$-\pi$};
\end{tikzpicture}

I have not tested this code, but I hope it is right.
 
  • #3
dwsmith said:
I am trying to label the y-axis with pi and -pi. How can I do that?

Code: 
\begin{tikzpicture}
\draw[->] (0,0) -- (3.5,0) coordinate (x axis);
\draw[->] (0,-3.5) -- (0,3.5) coordinate (y axis);
\end{tikzpicture}

Hi dwsmith, :)

With some experimenting I found that the following code works. :) Note that I have inserted the blue part to your code.

Code: 
\begin{tikzpicture} [COLOR=#0000ff]

%ticks[/COLOR]
[COLOR=#0000ff]\foreach \y/\ytext in {-3.14/-\pi,3.14/\pi}[/COLOR]
[COLOR=#0000ff]\draw (1pt,\y) -- (-3pt,\y) [/COLOR]
[COLOR=#0000ff]node[anchor=east] {$\ytext$}; [/COLOR]
[COLOR=#0000ff]%[/COLOR]

\draw[->] (0,0) -- (3.5,0) coordinate (x axis);
\draw[->] (0,-3.5) -- (0,3.5) coordinate (y axis);

\end{tikzpicture}

>>Here<< is a useful resource that you can find examples of these kind of things. :)

Kind Regards,
Sudharaka.
 

FAQ: Labeling Y-Axis with Pi and -Pi

What is the significance of labeling the Y-Axis with Pi and -Pi?

The Y-Axis represents the vertical values on a graph, and labeling it with Pi and -Pi indicates that the graph is showing data related to circles or arcs. Pi is the mathematical constant that represents the ratio of a circle's circumference to its diameter, while -Pi is the negative value of Pi. This labeling is commonly used in trigonometry and calculus.

How do I interpret the values on the Y-Axis labeled with Pi and -Pi?

The values on the Y-Axis labeled with Pi and -Pi are multiples of Pi. For example, if the Y-Axis is labeled with Pi, the values could be 0, Pi/2, Pi, 3Pi/2, etc. These values represent the arc length or angle in radians. Negative values represent angles or arcs in the clockwise direction, while positive values represent angles or arcs in the counterclockwise direction.

Can the Y-Axis be labeled with other values besides Pi and -Pi?

Yes, the Y-Axis can be labeled with any numerical values depending on the data being represented on the graph. However, using Pi and -Pi is common when working with circular or trigonometric functions.

How is labeling the Y-Axis with Pi and -Pi helpful in understanding graphs?

Labeling the Y-Axis with Pi and -Pi helps in understanding the periodic nature of certain functions. For example, the sine and cosine functions have a period of 2Pi, which means that the graph will repeat itself every 2Pi units on the Y-Axis. By labeling the Y-Axis with Pi and -Pi, it becomes easier to identify the cycles and patterns in the graph.

Is there a specific way to label the Y-Axis with Pi and -Pi?

There is no specific way to label the Y-Axis with Pi and -Pi, as it may vary depending on the type of graph or data being represented. Some graphs may only have a few values labeled, while others may have a full range of values. It is important to consider the data and the purpose of the graph when labeling the Y-Axis with Pi and -Pi.

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