show values on plot matplotlib python

Publié le: 30 janvier 2025
sur la chaîne: CodeKick
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certainly! in this tutorial, we'll learn how to display values on a plot using matplotlib in python. this can be particularly useful for making your plots more informative and easier to understand.

step 1: install matplotlib

if you haven't already installed matplotlib, you can do so using pip. open your terminal or command prompt and run:



step 2: basic plotting with matplotlib

let's start with a simple example of plotting some data.



step 3: adding values to the plot

to display the values of each point on the plot, we can use the `text` function from matplotlib. this function allows us to place text at specific coordinates on the plot.

here's how to modify the previous example to include value annotations:



explanation of the code

1. **importing matplotlib**: we start by importing the `pyplot` module from matplotlib.

2. **sample data**: we define our x and y data points.

3. **creating the plot**: we plot the data using `plt.plot()`. the `marker='o'` argument adds circular markers at each data point for better visibility.

4. **adding titles and labels**: we set the title and axis labels for clarity.

5. **annotating values**:
we use a `for` loop to iterate over the `y` values.
the `plt.text()` function is used to add text annotations at the (x, y) coordinates of each point.
we convert each value to a string using `str(value)` and set the font size and alignment.
the `ha='center'` and `va='bottom'` parameters center the text horizontally and position it slightly above the data points vertically.

customization options

you can customize the text appearance further by adjusting the following parameters in the `plt.text()` function:

`fontsize`: change the size of the text.
`color`: set the color of the text (e.g., `color='red'`).
`fontweight`: change the weight (e.g., `fontweight='bold'`).
`rotation`: rotate the text to a specified angle.

example with customization

here's an example with some custom text styling:



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