# Chris McComb

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www.cmccomb.com

sites.psu.edu/hsdl

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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

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

| accepted

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

| accepted

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

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

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

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

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

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

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...

9 years ago | 0

| accepted