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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

13 years ago

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

13 years ago

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

13 years ago

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Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

13 years ago

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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

13 years ago

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Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

13 years ago

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

13 years ago

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

13 years ago

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

13 years ago

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

13 years ago

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

13 years ago

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Add two numbers
Given a and b, return the sum a+b in c.

13 years ago

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

13 years ago

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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 ...

13 years ago

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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...

13 years ago

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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:...

13 years ago

Answered
how to efficiently find the indices?
Matlab has a nice function built in for this [B,I,J] = UNIQUE(...) also returns index vectors I and J such that B = A(I...

13 years ago | 1

Answered
eomday extension for wrapping month numbers
eomday([2012, 2013], {3:12, 1:3}) would work like this eomday([repmat(2012,1,10) repmat(2013,1,3)], [3:12 1:3]) Us...

13 years ago | 1

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Answered
Matlab Database Toolbox
I don't see a join in the tool you can just write the SQL for it. Generate the M-file from a basic query then just add you join ...

13 years ago | 0

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Error "Too many DATANAMES" for number series
It's definitely not too big. I bring in sets much larger than this all the time. I've never used the FTStool, but sometimes when...

13 years ago | 1

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Answered
Ski Jump HELPPPP
I'm pretty sure you want to set up A as the system of linear equations like this A=[0 0 0 1; 1 1 1 1; 0 0 1 0; 3 2 1 0] ...

13 years ago | 0

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deleting selective multiple rows from a data matrix
couple of problems B<2 & B>3 is always false you need to use a logical index to filter rows of A, B is not logical (all...

13 years ago | 0

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vertcat double and cell
you have to convert so you have the same data types. I converted the double to a cell array. results.time=[1:256]'; resu...

13 years ago | 0

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Matlab and Access
It would help to have the error message but if eid12 and dt are numbers (doubles) you have to convert them to strings. Also you ...

13 years ago | 0

Question

Emailing Images
Is there a way to make it so the image appears in the body of the email instead of an attachment? My image is a created from a ...

13 years ago | 1 answer | 1

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answer

Answered
The technique of using "xlsread"
First you have to read in both numbers and txt [num txt]=xlsread('Book2.xlsx','Sheet1') then you can find the cell that ...

13 years ago | 0

Answered
Best Structure for a Trading Model based on Stock Indices
I prefer to use datasets for all of my data, especially if it is coming from Excel. http://www.mathworks.com/help/toolbox/stat...

14 years ago | 0

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Answered
given two dates (1/1/2012, 12/1/2012), how to have an array of months (1/1/2011,2/1/2011,...,12/1/2012)??
something like this maybe dv=datenum('1/1/2012'): datenum('12/1/2012'); dv=datevec(dv); dv=datenum(dv(dv(:,3)==1,:))...

14 years ago | 2

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Files on path are inaccessible (sometimes)
I get this error sometimes when I am working on a server and have drives mapped differently. I don't think this is your issue si...

14 years ago | 0

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Image Processing: Array Problem - right justify?!
array(array==0)=NaN are you planning on using nanmean?

14 years ago | 1