You want to plot a 3D bar chart showing monthly revenue for 4 products over 3 quarters. Which data setup is correct for ax.bar3d()?

hard📝 Application Q8 of 15

Matplotlib - 3D Plotting

You want to plot a 3D bar chart showing monthly revenue for 4 products over 3 quarters. Which data setup is correct for ax.bar3d()?

Ax = [0,1,2,3]*3; y = [0]*4 + [1]*4 + [2]*4; z = [0]*12; dx = dy = 0.8; dz = revenue_values

Bx = [0,1,2]; y = [0,1,2,3]; z = [0]*7; dx = dy = 1; dz = revenue_values

Cx = [0,1,2,3]; y = [0,1,2]; z = [0]*7; dx = dy = 1; dz = revenue_values

Dx = [0,1,2,3]; y = [0,1,2]; z = [0]*12; dx = dy = 1; dz = revenue_values

Step-by-Step Solution

Solution:

Step 1: Understand data dimensions
4 products over 3 quarters = 12 bars total.
Step 2: Setup x and y coordinates
x repeats product indices for each quarter; y repeats quarter indices for each product.
Step 3: Initialize z and bar sizes
z is zero (base height), dx and dy set bar widths, dz holds revenue heights.
Step 4: Evaluate options
x = [0,1,2,3]*3; y = [0]*4 + [1]*4 + [2]*4; z = [0]*12; dx = dy = 0.8; dz = revenue_values correctly matches lengths and setup; others have mismatched lengths or incorrect repeats.
Final Answer:
Option A -> Option A
Quick Check:
Coordinates must align with data length [OK]

Quick Trick: Match x, y lengths to data points count [OK]

Common Mistakes:

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