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Highlights

goc3
最後のアクティビティ: 2024 年 10 月 21 日

Do you have the tab key insert spaces instead of tabs?

Always!

29%

It depends

14%

Never!

21%

I didn't know that was possible

36%

1810 票

Highlights

goc3
最後のアクティビティ: 2024 年 9 月 30 日

My favorite type of Cody problem is:

quick / easy

21%

themed / in a group

20%

challenge (e.g., banned functions)

13%

puzzle / game

16%

educational

28%

other (comment below)

117 票

Highlights

goc3
最後のアクティビティ: 2024 年 7 月 22 日

Which of the following is not a built-in string-checking function?

isstring

11%

ischar

iscellstr

13%

isletter

21%

isspace

ispunctuation

37%

2455 票

Highlights

goc3
最後のアクティビティ: 2024 年 10 月 4 日

How many code files are typically in your MATLAB Projects (scripts, functions, classes, tests)?

Don't use / What are Projects?

26%

1–10

31%

11–20

15%

21–30

31–50

51+ (comment below)

12%

4070 票

Highlights

goc3
最後のアクティビティ: 2024 年 10 月 7 日

How many spaces per tab do you prefer?

17%

12%

59%

Other (comment below)

6419 票

Highlights

goc3
最後のアクティビティ: 2024 年 5 月 14 日

Which of the following does not return the correct length (5) of v = [6,2,9,7,3]?

numel(v)

length(v)

13%

width(v)

14%

nnz(v)

size(v, 1)

27%

sum(v > 0)

31%

2537 票

Highlights

goc3
最後のアクティビティ: 2024 年 4 月 16 日

Which of the following is not really a missing value? (Or, which option is false?)

ismissing( { [ ] } )

26%

ismissing( NaN )

18%

ismissing( NaT )

11%

ismissing( missing )

21%

ismissing( categorical(missing) )

ismissing( { '' } ) % 2 apostrophes

16%

896 票

Highlights

goc3
最後のアクティビティ: 2024 年 4 月 10 日

Which of the following produces a false value?

isempty( [ ] )

10%

isempty( { } )

13%

isempty( '' ) % 2 single quotes

13%

isempty( "" ) % 2 double quotes

24%

c = categorical( [ ] ); isempty(c)

18%

s = struct("a", [ ] ); isempty(s.a)

22%

1324 票

Highlights

goc3
最後のアクティビティ: 2024 年 4 月 2 日

Which does NOT return sorted output for a vector of unique values (e.g., v = [3,7,2,5,1])?

sort(v)

unique(v)

16%

union(v, [ ])

17%

intersect(v, v)

14%

setdiff(v, [ ])

12%

All return sorted output

33%

1193 票

Highlights

goc3
最後のアクティビティ: 2024 年 3 月 27 日

Which of the following will not result in MATLAB as the output? (It may be a string or char. array.)

s = ['M','A','T','L','A','B']

char([77,65,84,76,65,66])

"MAT" + "LAB"

21%

upper(char('matlab' - '0' + 48))

17%

fliplr("BALTAM")

17%

rot90(rot90('BALTAM'))

30%

2929 票

Highlights

goc3
最後のアクティビティ: 2024 年 4 月 14 日

Which of the following will not produce a 3x3 array of zeros in MATLAB?

eye(3) - diag(ones(1,3))

11%

0 ./ ones(3)

cos(repmat(pi/2, [3,3]))

16%

zeros(3)

20%

A(3, 3) = 0

32%

mtimes([1;1;0], [0,0,0])

12%

3009 票

General

goc3
最後のアクティビティ: 2023 年 11 月 6 日

Don't Reinvent the Wheel

Have you ever learned that something you were doing manually in MATLAB was already possible using a built-in feature? Have you ever written a function only to later realize (or be told) that a built-in function already did what you needed?

Two such moments come to mind for me.

1. Did you realize that you can set conditional breakpoints? Neither did I, until someone showed me that feature. To do that, open or create a file in the editor, right click on a line number for any line that contains code, and select Set Conditional Breakpoint... This will bring up a dialog wherein you can type any logical condition for which execution should be paused. Before I learned about this, I would manually insert if-statements during debugging. Then, after fixing each bug, I would have to delete those statements. This built-in feature is so much better.

2. Have you ever needed to plot horizontal or vertical lines in a plot? For the longest time, I would manually code such lines. Then, I learned about xline() and yline(). Not only is less code required, these lines automatically span the entire axes while zooming, panning, or adjusting axis limits!

Share your own Aha! moments below. This will help everyone learn about MATLAB functionality that may not be obvious or front and center.

(Note: While File Exchange contains many great contributions, the intent of this thread is to focus on built-in MATLAB functionality.)