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Brenden


Dalhousie University

Active since 2011

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Numerical round off / instability help? How to get more precision?
I am trying to calculate the complex magnetic attenuation coefficient using the code below (for 3 different materials: Al, Cu & ...

11 years ago | 1 answer | 0

1

answer

Question


How to run 3D FFT?
Hello, I was wondering if there was a way to do a 3D FFT on a set of data... I have written a script to calculate a functi...

12 years ago | 1 answer | 0

1

answer

Question


fopen gives -1. How to open??
My current work involves image processing. Just recently I have been looking at archived files from the early 2000's. The proble...

12 years ago | 1 answer | 0

1

answer

Question


Select multiple files in browser for conversion.
Hello, I have written a simple code for converting RGB bitmap's to 8 bit .bmp's and .pgm to 8 bit .bmp. The code is as follows, ...

12 years ago | 1 answer | 0

1

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Question


Converting .bmp stack to Biorad PIc (.PIC)
Hello all, I am doing some volume rendering and i am set up to create a stack of cuts or slices along an axis. Now what i wan...

13 years ago | 1 answer | 0

1

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Question


Change the name of the output file as a loop computes
Hello all, What i want to do is create a stack of files... i have a function F(x,y,z) and it is set to run and calculate F at ...

13 years ago | 2 answers | 0

2

answers

Answered
Plot in 3D a quadratic function
I am currently trying to plot 4 dimensional data in a 3D plot as well and i think one solution is to use scatter3(x,y,z,f(x,y,z)...

13 years ago | 0

Answered
plotting data
You can make the plane you will plot h on with meshgrid ex: [(B/H),fi]= meshgrid(domain of (B/H),domain of fi) Then you ...

13 years ago | 1

Question


for loops and the if statement
This is a beginner question im sure i just dont understand why is it that i have to use 2 equal signs in the if statement? ...

13 years ago | 2 answers | 0

2

answers

Question


??? Subscript indices must either be real positive integers or logicals.
clear all close all d=[0.7, 2, 23.3]; n=[1.5, 1.33, 1.00]; theta= zeros(length(d)); theta(1)= pi/6; for ii=1:(length(d)-...

13 years ago | 1 answer | 1

1

answer

Question


Writing parameters to a text file
Hello all, I was hoping that someone could help me with writing a text file in matlab. What i have is a program that has many ...

13 years ago | 2 answers | 0

2

answers

Question


Grayscale image and imshow
I have a grayscale jpg image. I have used a window function to bring the edges down to 0 however over the range that i have mult...

13 years ago | 1 answer | 0

1

answer

Question


Data sets from image
I am new to Matlab and I have a jpg image that I have loaded. the image is not shown as data points that are plotted... not sure...

13 years ago | 1 answer | 0

1

answer

Question


Why do i have to take the abs when using fft and ifft?
I have a simple code to test how matlab processes the fft and ifft command: clear all close all N=1e4; ...

13 years ago | 2 answers | 0

2

answers