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Sarah Wait Zaranek

MathWorks

Active since 2011

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Professional Interests: parallel computing, geophysics

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Answered
Array manipulation ... a better way?
You can do this with logical indexing (and not a for-loop) q = zeros(length(p(:,1)),1); Find where the first column is e...

11 years ago | 0

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Answered
load several (one after another ) .mat Files via a For-Loop Job
Unless I am missing something, I think the easiest thing would be to do a nested for loop. for ii = 1: Number load(['co...

11 years ago | 6

| accepted

Answered
How to fit histogram data with normfit using signed X-axis ?
Probably the easiest way to handle this, if you like what the distribution fitting tool is doing, is to autogenerate code from ...

11 years ago | 0

| accepted

Answered
Reproducing the "Evaluate" function from "basic fitting" GUI directly in code
You can use the polyfit function to fit your data programatically. You can then use polyval to evaluate the polynomial at a giv...

11 years ago | 0

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Answered
Question regarding the Spredsheet link EX tool
These sections in the documentation should walk you through the basics of using Spreadsheet Link EX. http://www.mathworks.com...

11 years ago | 0

Answered
Error running parallel simulations
It looks like your mex file is still being used in MATLAB memory. You can try to see if clearing mex files will help, clea...

11 years ago | 0

Answered
sharing matrix in parfor
There is no way to do shared memory automatically in a parfor loop. However, depending on where the data is located - there may...

11 years ago | 1

Answered
Sscanf /sprintf usage
I think this is your issue -- From doc for sscan - "Format specifiers for the reading functions sscanf and fscanf differ f...

12 years ago | 0

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Answered
How to Save Matrices to excel multiple times with incremental excel name to avoid overwrite
The easier way to to construct a new filename within the loop by converting the index to a string and adding it the original nam...

12 years ago | 2

| accepted

Answered
converting .mat to .dat file
This should do it. Note: I made a sample mat-file with x,y,a as my variables. load test.mat dlmwrite('test.dat',[x y a]...

12 years ago | 0

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Answered
Randomly Choose number from a matrix of several numbers?
Instead of starting with your code - I will give an example of how I would do it. Hopefully this can see how you implement it i...

12 years ago | 0

Answered
Controlling Dll files from Matlab
First step is to see if you can use loadlibrary interface in MATLAB. See this section of the documentation on how to call C ...

12 years ago | 0

Answered
Loops are slow inside spmd blocks!!
Looks like loops inside parfor/spmd with tons of iterations are not getting all the benefit from JIT (Just-in-Time interpreter/c...

12 years ago | 0

Answered
Writing a cell array to excel but skipping certain values
I think it is clear what you want to do- I don't have MATLAB open, so forgive minor syntax issues. 1. Step one extract the ...

12 years ago | 1

Answered
export to excel
This should work out for you. Reshape the array so it is an nx*ny by 4 and then use the xlswrite command. A = rand(18,30...

12 years ago | 0

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Answered
CPU ID and EXE
You can run any command to the operating system via the bang (!) command, something like this (for a Windows machine) will give ...

12 years ago | 0

Answered
How to autoload a custom function in cftools
I believe what you want to do is to highlight the data you don't want to fit using the "outlier" tool. <http://www.mathwork...

12 years ago | 0

Answered
How to autoload a custom function in cftools
A couple of options for you. 1. You can autogenerate the code to do the fit from cftool. Then you can repeat the analysis wit...

12 years ago | 0

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Answered
Changing a single element in sparse matrices
In general, it is useful to define the values and locations of the non-zero entries of your sparse matrices - and then only crea...

12 years ago | 0

Answered
Semilogy Plot not showing minor tick marks
The X Minor ticks are off by default. This should turn them back on. ax = gca; % grabs current axis set(ax,'XMinorTi...

12 years ago | 0

Answered
Running MATLAB from Excel - Matlab Builder Ex or Matlab Spredsheet link EX?
It basically breaks down to if you want the end user who is running the model within Excel to have MATLAB or not. Spreadshe...

12 years ago | 1

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Answered
Parallel for loop: Using broadcasting array variable values as indexes
For parfor loops, when you index into a sliced variables, restrictions are placed on the first-level variable indices. This allo...

12 years ago | 2

| accepted

Answered
memmapfile in parfor loops
You should be able to use memmapfile in a parfor loop. The trick is to pass m into a function within the parfor loop. You can g...

12 years ago | 3

Answered
plot integral
This can be done using cumtrapz -- Doc here: <http://www.mathworks.com/help/releases/R2011a/techdoc/ref/cumtrapz.html> ...

13 years ago | 4

Answered
How to brush data automatically?
Only certain plots can be brushed. The doc has list here of what you can and can't brush: <http://www.mathworks.com/help/release...

13 years ago | 1

Answered
how to open 3D image from a series of 2D image?
This demo using MRI data should help you get started: <http://www.mathworks.com/help/releases/R2011a/techdoc/visualize/f5-329...

13 years ago | 2

Answered
parallel computing with scheduler Comsol-Matlab
COMSOL helped me with a similar issue about a year ago. Their answer is below. I would encourage you to contact them. They were...

13 years ago | 2

Answered
several slices of a 2D-image interpolate to 3D
This demo is probably a good first start for you. Displaying MRI Data: <http://www.mathworks.com/help/techdoc/visualize/...

13 years ago | 0

Answered
receiving a sparse matrix
If I understand you correctly, what you want to do is take your cell array (1 x 40) - and for each column of the cell array maps...

13 years ago | 0

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Answered
bar3 color
I believe this will work for you. Basically I am resetting each set of bars colormap by changing the CData of the patches that ...

13 years ago | 0

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