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Chris McComb


Last seen: 4 years ago |  Active since 2013

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www.cmccomb.com
sites.psu.edu/hsdl

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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
Creating Multiple Windowed Plots
You can use the command figure() to open a new window to plot in.

9 years ago | 0

| accepted

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

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Answered
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

Answered
non-linear optimization over a frequency bandwidth
I think you can do exactly what you said: maximize the average voltage output. Use fmincon, but write an objective function t...

9 years ago | 0

Answered
Is numeric gradient estimation well-posed
It will depend a great deal on the characteristics of your function. If your function is smooth, then you can generally expect g...

9 years ago | 0

Answered
How can I set transparency in 2D plot?
I don't think there's a way to make markers transparent. However, you could plot each data point as a small circle (using patch)...

9 years ago | 2

| accepted

Answered
Creating a blank canvas in Matlab
I think that you should probably approach this using the patch command. This will allow you to specify circles with your desired...

9 years ago | 1

Answered
Matlab: Can anyone explains this geometry file
The snippet that you want to focus on is part of a switch statement. The variable nargin is a integer that tells you how many ar...

10 years ago | 0

| accepted