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# Michael

Active since 2011

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Question

Generate random numbers with custom PDF
Hi, as it may become clear I'm fairly weak on probability distributions I want to generate a set of random numbers between 0 ...

10 years ago | 4 answers | 2

### 4

Question

imshow / pcolor ... inconsistent plotting
Hi Just asking to confirm something as I have never noticed this before and it's confusing me a bit. I'll use a simple exampl...

10 years ago | 1 answer | 0

### 1

Question

imshow - plotting a circular image, how to make corners white?
Hi I have a circular image but it's stored as a grayscale matrix, ie. square. When I use "imshow" with the jet colormap it au...

10 years ago | 2 answers | 0

### 2

Question

how to preallocate large logical array
Hi I'm trying to pre-allocate a huge logical matrix but I can't work out how to do it without creating a normal matrix then c...

10 years ago | 3 answers | 2

### 3

Question

Parfor error?
------------------------------------------------------------------------ Segmentation violation detected at Mon...

10 years ago | 1 answer | 0

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how to label lines on a graph
The general method would be using the legend function, to which you give a vector of the plot object handles and a series of cor...

10 years ago | 5

Question

Problem with surf / pcolor / image
Hi I have a matrix and I want a pcolor-style plot where each square (and therefore its colour) corresponds to an element. Cur...

10 years ago | 2 answers | 0

### 2

having one "for" loop instead of two
From the comments I think you want the surface c = a + b Just use a nested loop c = zeros(11); for a = 0:10 fo...

10 years ago | 0

converting a group of .fig files into .pdf
Are the files named according to some nice rule? eg. 1.fig, 2.fig, ... maybe you can write a script based on openfig / print (th...

10 years ago | 0

| accepted

Linear Regression - more weight on specific Bins of data
lsqnonlin may be a good place to start, rather than giving it your model function and a starting point (eg. lsqcurvefit), you gi...

10 years ago | 0

pcolor command
try pcolor(imrotate(A,90)) This should move the top left corner to the bottom left.

10 years ago | 0

Optimization gives only small changes in each step, Why and how to solve it?
Which MATLAB function are you using? Certain ones allow you to input parameters that relate to how far you anticipate the minimu...

10 years ago | 0

Question

parfor - how do I "slice" a variable? Can I?
I have a parfor loop that takes one row of a matrix and uses it for calculations. I therefore am getting errors since I am ca...

10 years ago | 1 answer | 0

### 1

How to fully use the CPU of my PC?
100% CPU load is not a test that your code is optimised! It is just a sign that the hardware bottleneck may be in your processor...

10 years ago | 1

Question

one line takes ages, but is it possible to optimise any more?
Need a little help, I'm running this code a lot and small differences lead to big time savings. I have a large matrix (512x512)...

10 years ago | 3 answers | 0

### 3

Looping a function m-file, figures not closing

10 years ago | 0

Question

Looping a function m-file, figures not closing
Hi, I'm running a script which repeatedly calls a function I wrote (using a for loop). In this function there is a command to...

10 years ago | 3 answers | 0