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# Matplotlib Grid Lines # Matplotlib Grid Lines We can use the grid() method in pyplot to set grid lines in the chart. The grid() method syntax is as follows: matplotlib.pyplot.grid(b=None, which='major', axis='both', ) **Parameter Description:** * **b**: Optional, default is None, can set a boolean value, true means display grid lines, false means do not display, if **kwargs parameter is set, the value is true. * **which**: Optional, optional values are 'major', 'minor' and 'both', default is 'major', indicates the grid lines to apply changes to. * **axis**: Optional, set which direction to display grid lines, can be 'both' (default), 'x' or 'y', representing both directions, x-axis direction or y-axis direction respectively. * ****kwargs**: Optional, set grid style, can be color='r', linestyle='-' and linewidth=2, representing the grid line's color, style and width respectively. The following example adds a simple grid line, using default parameter values: ## Example import numpy as np import matplotlib.pyplot as plt x = np.array([1,2,3,4]) y = np.array([1,4,9,16]) plt.title("TUTORIAL grid() Test") plt.xlabel("x - label") plt.ylabel("y - label") plt.plot(x, y) plt.grid() plt.show() The result is as follows: !(#) The following example adds a simple grid line, using axis parameter set to 'x', to display grid lines in the x-axis direction: ## Example import numpy as np import matplotlib.pyplot as plt x = np.array([1,2,3,4]) y = np.array([1,4,9,16]) plt.title("TUTORIAL grid() Test") plt.xlabel("x - label") plt.ylabel("y - label") plt.plot(x, y) plt.grid(axis='x')# Set y to display grid lines in the axis direction plt.show() The result is as follows: !(#) The following example adds a simple grid line and sets the grid line style, format is as follows: grid(color = 'color', linestyle = 'linestyle', linewidth = number) **Parameter Description:** **color:** 'b' blue, 'm' magenta, 'g' green, 'y' yellow, 'r' red, 'k' black, 'w' white, 'c' cyan, '#008000' RGB color string. **linestyle:** '‐' solid line, '‐‐' dashed line, '‐.' dash-dot line, ':' dotted line. **linewidth**: Set the line width, can set a number. ## Example import numpy as np import matplotlib.pyplot as plt x = np.array([1,2,3,4]) y = np.array([1,4,9,16]) plt.title("TUTORIAL grid() Test") plt.xlabel("x - label") plt.ylabel("y - label") plt.plot(x, y) plt.grid(color ='r', linestyle ='--', linewidth =0.5) plt.show() The result is as follows: !(#)