# Chris McComb

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www.cmccomb.com

sites.psu.edu/hsdl

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Reduced Rank Regression

Multivariate regression via rank reduction.

6 years ago | 2 downloads |

Solved

Sum the numbers on the main diagonal

Sum the numbers on the main diagonal of an n-by-n matrix. For input: A = [1 2 4 3 6 2 2 4 7]...

9 years ago

Solved

Distance walked 3D

suppose you go from x-y-z coordinates [3,4,2] to [0,0,2] to [0,1,2] to [1,1,2], to [1,1,20] then you walked 25 units of distance...

9 years ago

Solved

Arrange vector in ascending order

Arrange a given vector in ascending order. input = [4 5 1 2 9]; output = [1 2 4 5 9];

9 years ago

Is there a mathwork about tensegrity structure?

You might want to start <http://www.markschenk.com/tensegrity/files.html here> .

9 years ago | 1

| accepted

Solved

Replace Vector Elements

Replace all elements in a vector which are equal to or smaller than zero with 0.1. Example: A = [1 2 3 -1 0 2 -3 -80]; ...

9 years ago

Solved

Back to basics 7 - Equal NaNs

Covering some basic topics I haven't seen elsewhere on Cody. Given 2 input variables, output true if they are equal, false ot...

9 years ago

Solved

Back to basics 21 - Matrix replicating

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, generate an output matrix that consists o...

9 years ago

loop for extracting columns of a matrix

If you have a matrix, M, you can access column i (as a vector) by using M(:, i). (The colon indicates 'every row')

9 years ago | 0

Remove intercept with "regress"

I think that all you need to do is remove the first column from your second argument (i.e. the column of 1's). [b17, bint1...

9 years ago | 0

Replacing elements in matrix columns

You can do the replacement using logical indexing. The replacement for 34 --> 1 would be as follows: for i=2:3 idx = (...

9 years ago | 0

can i change the x axis without changing the plot? So i have a array with 10000 numbers in it, i want to plot thoes 10000 numbers in time, like 0-10sec insted of 0-10000.

You just need to supply a vector of x values. Something like x = linspace(0, 10, length(buf)); Then, just plot as ...

9 years ago | 0

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Can anyone explain from the third line till the end of below code..??

The third line from the end contains only the word 'else'. This is typical syntax for the if control structure. In the example, ...

9 years ago | 0

Creating Multiple Windowed Plots

You can use the command figure() to open a new window to plot in.

9 years ago | 0

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save txt file in loop

You could do something like this using the dlmwrite function: for i=1:1:50 dlmwrite(sprintf('%d.txt', i), magic(i));...

9 years ago | 0

How do I change the resolution of an image produced by imagesc?

To use imresize, you first read the image in: a = imread('image.jpg'); Then, you apply imresize as follows (for example ...

9 years ago | 0

How to draw smooth balls (spheres) and sticks (cylinders) around my XYZ points.

This should do what you're looking for regarding the spheres (but see my above comment for cylinders). % Parameters SPHE...

9 years ago | 1

finding slope of a curve at some specific points

You might want to start by looking at MATLAB's gradient function. You could also use simple finite difference formulas, like: ...

9 years ago | 1

Fast interp1 with 'spline'

Are you calling interp1 with a vector or lookup points? If not, doing so could give you a significant speed-up.

9 years ago | 0

Data vectors with different time intervals

You should interpolate the temperature data. You can do this using a variety of methods, which you can find <http://www.mathwork...

9 years ago | 0

How significantly does the platform Matlab is run on affect numerical precision?

This difference could be a result of slightly different <http://www.netlib.org/blas/ BLAS> implementations. <http://www.mathw...

9 years ago | 0

3D mesh/surf plot puzzle

You should try using the bar3 function, as follows: bar3(img, 1.0) The 1.0 sets the width to unity, so that the bars a...

9 years ago | 1

| accepted

Solved

Number of Horns on a unicorn!

Calculate the number of horns on a *unicorn*! And I'm talking about a unicorn with not more than one horn on it!

9 years ago

Solved

Clean the List of Names

Given a list of names in a cell array, remove any duplications that result from different capitalizations of the same string. So...

9 years ago

Displaying the order of objects on an axis

You're having this problem because the rectangle command draws the object in the xy plane, with z=0. Therefore, since I'm guessi...

9 years ago | 0

| accepted

Solved

Back to basics 15 - classes

Covering some basic topics I haven't seen elsewhere on Cody. Return the class of the input variable.

9 years ago

Solved

Back to basics 9 - Indexed References

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix and row and column, output the index of th...

9 years ago