Polyline editing (PEDIT) in AutoCAD - Cell-by-Cell Formula Trace

Concept Flow

Polyline Segments: 5 --- 7 --- 3
  |       |       |
  +-------+-------+
  Total Length = Sum of segments

This concept shows how polyline segments with lengths 5, 7, and 3 are combined using the PEDIT command to get the total polyline length by summing these segments.

Formula

=SUM(B1:B3)

This formula sums the lengths of polyline segments in cells B1, B2, and B3 to calculate the total polyline length.

Step-by-Step Trace

Step	Expression	Evaluates To	Explanation
1	SUM(B1:B3)	5 + 7 + 3	SUM adds the values in B1, B2, and B3 representing segment lengths.
2	5 + 7 + 3	15	Adding the segment lengths results in total length 15.

The final result 15 is the total length of the polyline after joining segments.

Variable Tracker

Cell	Value	Description
B1	5	Length of polyline segment 1
B2	7	Length of polyline segment 2
B3	3	Length of polyline segment 3
B4	15	Total polyline length calculated by formula

Key Moments

What does the formula =SUM(B1:B3) compute?

What is the final total length after summing segments?

Sheet Trace Quiz - 3 Questions

What is the purpose of the formula =SUM(B1:B3)?

A Calculate the total length of polyline segments

B Calculate the length of the first segment only

C Calculate the average length of segments

D Calculate the difference between longest and shortest segment

Key Result

Using the PEDIT command in AutoCAD is like summing polyline segment lengths in a spreadsheet to get the total polyline length.

Transcript

We start with three polyline segments with lengths 5, 7, and 3. Using the formula =SUM(B1:B3), we add these lengths step by step. First, the SUM function collects the values 5, 7, and 3. Then, it adds them to get 15. This final value represents the total length of the polyline after editing with PEDIT.

Practice

1. What is the primary purpose of the PEDIT command in AutoCAD?

easy

A. To edit polylines by joining, smoothing, or changing their shape

B. To create new layers for organizing drawings

C. To measure distances between points

D. To change the color of objects

Solution

1. Step 1: Understand the function of PEDIT

   The PEDIT command is designed specifically for editing polylines, allowing users to join segments, smooth curves, and modify shapes.

2. Step 2: Compare with other options

   Options A, B, and C relate to coloring, layers, and measuring, which are not the main functions of PEDIT.

3. Final Answer:

   To edit polylines by joining, smoothing, or changing their shape -> Option A

4. Quick Check:

   PEDIT edits polylines = D [OK]

Hint: PEDIT is for polylines editing only, not layers or colors [OK]

Common Mistakes:

• Confusing PEDIT with layer management commands
• Thinking PEDIT measures distances
• Assuming PEDIT changes object colors

2. Which of the following is the correct syntax to start the PEDIT command in AutoCAD?

easy

A. EDITPOLYLINE

B. POLYEDIT

C. PLINEEDIT

D. PEDIT

Solution

1. Step 1: Recall the exact command name

   The correct command to edit polylines in AutoCAD is PEDIT.

2. Step 2: Verify other options

   Options A, B, and D are incorrect as they are not recognized AutoCAD commands for polyline editing.

3. Final Answer:

   PEDIT -> Option D

4. Quick Check:

   Command to edit polylines = PEDIT [OK]

Hint: Remember the exact command: PEDIT, not variations [OK]

Common Mistakes:

• Typing similar but incorrect commands like POLYEDIT
• Using full words instead of command abbreviations
• Confusing with other editing commands

3. Given a polyline with two separate segments, what will happen if you use PEDIT and choose the Join option with a small gap between segments?

medium

A. The segments will remain separate regardless of gap size

B. The segments will join into a single polyline if the gap is within the specified tolerance

C. The segments will be deleted

D. The command will produce an error and stop

Solution

1. Step 1: Understand the Join option in PEDIT

   The Join option in PEDIT connects separate polyline segments into one if the gap between them is less than the specified joining tolerance.

2. Step 2: Analyze the effect of gap size

   If the gap is small enough, the segments join; if too large, they stay separate. No deletion or errors occur.

3. Final Answer:

   The segments will join into a single polyline if the gap is within the specified tolerance -> Option B

4. Quick Check:

   Join merges close segments = A [OK]

Hint: Join works only if gap is small enough [OK]

Common Mistakes:

• Assuming segments join regardless of gap size
• Thinking segments get deleted after join
• Expecting errors when joining segments

4. You tried to use PEDIT to join two polylines but got an error saying "Object is not a polyline." What is the most likely cause?

medium

A. One or both objects are simple lines, not polylines

B. The polylines are on different layers

C. The drawing is corrupted

D. You did not select any object

Solution

1. Step 1: Understand the error message

   The error "Object is not a polyline" means the selected object is not recognized as a polyline by AutoCAD.

2. Step 2: Identify common causes

   Simple lines are different from polylines and cannot be edited with PEDIT unless converted first.

3. Final Answer:

   One or both objects are simple lines, not polylines -> Option A

4. Quick Check:

   Non-polyline objects cause this error = B [OK]

Hint: Check if objects are polylines before using PEDIT [OK]

Common Mistakes:

• Assuming layer differences cause this error
• Blaming drawing corruption without checking object type
• Ignoring selection step

5. You have a polyline with sharp corners, and you want to smooth it by converting corners into curves. Which PEDIT option should you use, and what additional parameter must you specify?

hard

A. Use the Join option and specify the curve smoothness

B. Use the Width option and set a curve radius

C. Use the Spline option and specify the fit tolerance

D. Use the Spline option to smooth the polyline; no additional parameter needed

Solution

1. Step 1: Identify the smoothing option in PEDIT

   The Spline option converts sharp corners into smooth curves on a polyline.

2. Step 2: Understand the parameter needed

   When using Spline, you must specify the fit tolerance to control how smooth the curve becomes.

3. Final Answer:

   Use the Spline option and specify the fit tolerance -> Option C

4. Quick Check:

   Spline with fit tolerance smooths corners = A [OK]

Hint: Spline option needs fit tolerance for smooth curves [OK]

Common Mistakes:

• Using Join instead of Spline for smoothing
• Setting Width instead of fit tolerance
• Skipping the fit tolerance parameter