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David


Last seen: 2 years ago |  Active since 2013

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Question


Is it possible to join categorical variables in table according to group variables ?
I have a table (`A`) containing a string (`x`) of IDs and categorical (`y`) data types. For example: >> A.x 11×1 string arr...

3 years ago | 1 answer | 0

1

answer

Question


Speed up count of unique elements matching a given condition in Table
I have a table (`A`) containing string (`x`) and datetime (`y`) data types. For example: >>A.x(1:10) 10×1 string array ...

3 years ago | 1 answer | 0

1

answer

Answered
How to enter: square root of (5*e^(2x-1)-1) into matlab?
S=sqrt(5*exp(2*x-1)-1);

7 years ago | 1

| accepted

Question


Control figure properties in maineffectsplot
I am struggling with changing the appearance of the plot generated by the |maineffectsplot| function. I would like to control...

7 years ago | 1 answer | 1

1

answer

Answered
Optimizing a distance calculation for elements within a matrix
I guess, I am just going to use the parallel computing toolbox for this. I would still welcome any suggestions to speed this up....

11 years ago | 0

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

11 years ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

11 years ago

Question


Optimizing a distance calculation for elements within a matrix
Following up with my series of questions, I now have a new one. Lets recap,I have a three dimensional matrix of size (x,j,k). Th...

11 years ago | 2 answers | 0

2

answers

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

11 years ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

11 years ago

Question


How to find zero elements in a three dimensional matrix whose neighbors are all zero.
I have a three dimensional matrix of size (i,j,k). This matrix is composed of values ranging from 0 to 255. I am interested in i...

11 years ago | 1 answer | 0

1

answer