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Revision Notes

Introduction to Numpy — Revision Notes

CBSE · Class 11 · Informatics Practices

Introduction to Numpy revision notes for CBSE Class 11 Informatics Practices: 4 topics in quick points. Includes NumPy and Arrays, Creating NumPy Arrays.

125 questions80 flashcards6 formulas & key relations5 concepts

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Key Topics to Revise

1

1. NumPy and Arrays

  • NumPy stands for Numerical Python.
  • NumPy is a package for data analysis and scientific computing with Python.
  • NumPy can be installed using pip install NumPy.
2

2. Creating NumPy Arrays

  • A 1-D array has one row of elements.
  • A 2-D array can be created by passing nested lists to np.array().
  • array1 = np.array([10,20,30]) is an example of a 1-D array.
3

3. Indexing and Slicing

  • Array indexing is based on position and starts from 0.
  • This is called zero based indexing.
  • In a 2-D array, row-axis is axis-0 and column-axis is axis-1.
4

4. Operations on Arrays

  • Arithmetic operations on arrays are done element-wise when shapes are the same.
  • For element-wise operations, array1.shape must equal array2.shape.
  • Example arrays used for arithmetic are array1 = np.array([[3,6],[4,2]]) and array2 = np.array([[10,20],[15,12]]).

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Full Notes

Key Concepts

NumPy is a Python package usedThe official NumPy array objectA Python list can store differentArray indexing starts from 0A 1

Frequently Asked Questions

What are the important topics in Introduction to Numpy for CBSE Class 11 Informatics Practices?
Key topics in Introduction to Numpy include NumPy and Arrays, Creating NumPy Arrays, Indexing and Slicing, Operations on Arrays. Study these first, then practise questions on each for Class 11 exams.
How should I revise Introduction to Numpy for Class 11 exams?
Learn the core ideas first, then work through the 125 practice questions on Introduction to Numpy. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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