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Karl


University of Toronto

Last seen: 1 year ago |  Active since 2011

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Multivariate optimization subject to strange restraint
Hello, I have a multivariate optimization problem with, with what I think is a strange restraint. Essentially I have a function ...

9 years ago | 1 answer | 0

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Real time reading in a file
Hello. I want to write a function which continually reads in a file until some stopping criteria is met. I would like it to read...

10 years ago | 0 answers | 0

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answers

Question


Confidence intervals from fit
Hi, I'm currently trying to fit my data to the model y = a*(1-exp(x/b)), and extract the two constants a and b. I'm currently us...

10 years ago | 0 answers | 0

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Calculating the error on a non-linear least squares fit
Hi, so I'm currently running a program which fits some noisy data to a monoexponential function using a non-linear least squares...

10 years ago | 0 answers | 0

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Which statistical test to use?
Hi, I have a quick question. Basically I have measured a set of quantities in two different ways (way A and way B), and have als...

11 years ago | 0 answers | 0

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How to access ALL information of dicom header?
Hi, I have a dicom image from a GE MRI scanner and I was wondering how I can access all the information stored in the header? I ...

11 years ago | 0 answers | 0

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Question


Adding a line to a scatter plot
Hi, I have an old plot which I used 'scatter(x,y)' to generate. I would now, however, like to add in a line (i.e., connect the p...

12 years ago | 1 answer | 0

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Question


PCG and MINRES question
Hi, I have a problem which PCG and minres seem to be built to handle, i.e. I have A(x) = b, Where A is a function I've wr...

13 years ago | 2 answers | 0

2

answers

Answered
Least squares problem with large matrix
I should mention that I've tried some of MATLAB's built in iterative LSQ methods, such as pcg, and they did not converge. If som...

13 years ago | 0

Question


Least squares problem with large matrix
Hi, I have a simple matrix problem which I believe can be solved in two steps, Ultimately I am looking for a least squares so...

13 years ago | 2 answers | 0

2

answers

Question


A difficult multi-curve fitting problem
Hi, I have a question. Say I had a matrix (of, lets say nxm size, where n and m are ~= 1000). In this matrix there is the inform...

13 years ago | 0 answers | 0

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Question


Hexagonal Pixel Image
Hi! I've been working on developping an imaging system and currently I use a square matrix (so I can simply display my image via...

13 years ago | 0 answers | 0

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answers