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Kevin Holst


US Air Force

Active since 2012

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Answered
How can I change contents of a string?
I'd say do something like this: names = strrep({data{:,1}},'/','-'); That assumes that all of the names are only in the ...

12 years ago | 0

Solved


Sum of diagonal of a square matrix
If x = [1 2 4; 3 4 5; 5 6 7] then y should be the sum of the diagonals of the matrix y = 1 + 4 + 7 = 12

12 years ago

Solved


Given an unsigned integer x, find the largest y by rearranging the bits in x
Given an unsigned integer x, find the largest y by rearranging the bits in x. Example: Input x = 10 Output y is 12 ...

12 years ago

Answered
Calculate difference between two times
since you're getting this from a data file I'd suggest something like this: fid = fopen('data.txt'); data = textscan(fid...

12 years ago | 0

Answered
Loop Principal Component Analysis
I'd suggest looking at the help page a little more for PCA: http://www.mathworks.com/help/toolbox/stats/princomp.html "COE...

12 years ago | 0

Answered
Saving structs
If you're wanting to save the structure as a structure, don't put in the -struct flag. That saves all of the fieldnames as their...

12 years ago | 2

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Answered
breaking a column of strings in two different columns
It appears that you can't really do matrix operations on cell arrays like: mycell{:,2} = mycell{:,1}(3:end); So here's w...

12 years ago | 1

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Answered
Writing a matrix as column vectors
If Y is a workspace variable that is an m x n matrix, then you can extract the column vectors by: y1 = Y(:,1); etc. Is that...

12 years ago | 0

Answered
set default properties ERROR
It looks as though you may have a variable named 'set' in your workspace. Is that the case?

12 years ago | 1

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Answered
surf plot behaves strange!
Surf attaches a color to a face based on one point on that face, and each face will be created by 4 points, so that color may no...

12 years ago | 0

Answered
GRIDDATA suitability for interpolating from one mesh to another
griddata (in this case griddata3) is going to be removed in a future release of Matlab. Use TriScatteredInterp instead. I've use...

12 years ago | 0

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Answered
How to create random vectors of the same lengths?
from the documentation: Examples Generate values from the uniform distribution on the interval [a, b]. r = a + (b-a).*ra...

12 years ago | 0

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Answered
for loop
You can't call or write to a variable like that in a loop, unfortunately. My suggestion would be to have a structure that contai...

12 years ago | 0

Answered
Plot points with unknown column numbers
Here's the fix, sorry it took a while. Got distracted ;) figure(2) names = 1:1:rx; for i =1:1:rx name = i; ...

12 years ago | 0

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Answered
Plot points with unknown column numbers
did you turn hold back off? figure(2) names = 1:1:rx; for i =1:1:rx name = i; plot (fx,fy,'bo') ...

12 years ago | 0

Answered
geting value as Inf
Here's what I think your code should look like in order to run properly: M=100; r=0.8; alpha=0.45; beta=0.75; g...

12 years ago | 0

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Answered
Passing base workspace variables to callback functions
Have you tried using the evalin function, maybe something like: x = evalin('base','var');

12 years ago | 1

Answered
geting value as Inf
I actually answered your problem in your previous problem. The error is in your calculations for c, p, and specifically a. These...

12 years ago | 0

Answered
Rows
column1 = min(mat,[],2);

12 years ago | 1

Solved


Magic!
Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

12 years ago

Solved


Count from 0 to N^M in base N.
Return an array of numbers which (effectively) count from 0 to N^M-1 in base N. The result should be returned in a matrix, with ...

12 years ago

Solved


Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]

12 years ago

Answered
How can i get image from other GUI in a project - i can not use global variable
I'm assuming that the problem is you're unable to use the information you acquired from GUI2. Globals may work, but they're not ...

12 years ago | 2

Solved


pressure to dB?
given x ratio of pressure, find corresponding y dB

12 years ago

Answered
need help optimizing this code...
I don't think that will work actually. Try this, it's a little convoluted, but I think it's correct: % this assumes w and s...

12 years ago | 0

Answered
color-coding a 2D plot
unfortunately shading interp doesn't seem to work on contourf so here's an inelegant solution to your problem. [x,y] = mesh...

12 years ago | 1

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Answered
Problem with displaying output of executable
If you're compiling it as a 'Windows Standalone Application' switch that to a 'Console Standalone Application'.

12 years ago | 0

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Answered
color-coding a 2D plot
how about: [x,y] = meshgrid(-10:0.1:10,-10:0.1:10); % just to get some x and y values z = sqrt(x.^2 + y.^2); contour...

12 years ago | 0

Answered
Add label to TXT file
you could just add a simple fopen command prior to your dlmwrite command: fid = fopen('c:\data.txt','w'); fprintf(fid,'H...

12 years ago | 0

Answered
Change position of numbers on x axes in surface plot
Perhaps something like this would work for you? grid off %this prevents the addition of gridlines at half spacing ha =...

12 years ago | 0

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