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comparison/checking without for loop
nneg = sum(a==-1); npos = sum(a==1);

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Evaluate parameters in matlab
Presumably you have a formula that calculates flow, given all the other parameters. I am guessing that you have wrapped this in...

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Change default figure properties?
I don't know if there's a way to change the defaults, but you'll save a lot of work if you create a function to apply your 'defa...

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질문

Correct way to test if a value is a function?
I'm using the following test to check if a value is a function (standard or anonymous): if isa(value, 'function_handle') ...

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2

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how to test if toolbox exists?
Try this: v = ver; has_fsolve = any(strcmp(cellstr(char(v.Name)), 'Optimization Toolbox')); Or more specifically: ...

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How to edit mplay GUI?
I don't have that function in my installation, but is it called |mplay|? If so, just enter this in the command window: edi...

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finding turning points of a dataset
You can use |diff| or |gradient|. Decide what minimum rate of change is acceptable: tolerance = 1e-4; And then to fin...

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Subscripted assignment dimension mismatch
Enter the command: dbstop if error Now run your script and wait for it to break. Then, in the command window, execute...

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how to efficiently find the indices?
This comes straight out of some of my own code... I guess it's the reverse of what you want though. uM = unique(M); I =...

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Matlab Database Toolbox
Please don't be frightened of coding an SQL join. Look: SELECT <fields> FROM <table1> JOIN <table2> ON <table1.k...

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Thresholds for a thermal image
My advice is to start with the simplest approach and run with it until you can't go any further. THEN look at the more complex ...

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hyperthreading question
I'd like to see the results if you expand your operation to something that takes about 10 minutes. And do it with the utter min...

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how to plot curved fitting but the value of x and y must be key in by the user at the command window.
Do you mean that you are experiencing this: > x = input('x? ') x? 249 191 150 139 130 123 249 191 150 139 130 123 ...

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rescale histogram
Still not sure I understand your motive completely... But it seems like you have this situation: data = rand(100,1); ...

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Licensing: Parallel Computing Toolbox labs vs independent MATLAB sessions
Coming from a different programming background I would intuitively say that with parallelisation you can work concurrently with ...

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This Crosstalk Cancellation Function kills my computer!
I wouldn't be surprised if iTunes takes your computer down. Have you tried plotting the waveform in MatLab? Does it look sen...

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Making lines between data points smoother.
Perhaps you're looking for something like |spline|. I believe the entire notion of splines was invented by a boat-builder. =) ...

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Error Message: ??? Undefined function or method 'SimpleSurround' for input arguments of type 'char'.
1. Your function must be stored in a file called |SimpleSurround.m|. 2. That file must be in a directory that is on the MatLa...

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문제를 풀었습니다

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

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why fgetl read spaces?
I guess my heart is still in C... I love regexp, but if all I wanted to do was read integers (not strings), I'd do this after re...

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[DISCONTINUED] Wish-list for MATLAB Answer sections.
Lower the reputation required to obtain some kind of 'editor' status. At least to the point where obvious contributors can fix ...

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insert Image into MS SQL Database
Your question confuses me a little. Do you modify the image using plots etc in the axis control, or is the whole mention of the...

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Motion Tracking in original video(avi)
Okay, a quick skim over the code and it looks like your tracking algorithm works by thresholding a greyscale difference-image. ...

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Need help/ideas solving a problem
You can have a go at using simple function minimisation: best fit Start with a vector that represents all your shape characte...

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How to extract all variable names returned by Simulink.findVars?
Do you mean you have tried: disp(char(allVars(:).Name)); That would pad each name with spaces due to conversion to a cha...

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Opening an GUI real time
You should also have an m-file associated with these figures. I will assume that you created these GUIs using GUIDE. To invo...

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Reverse the colorbar axis
The call to |colorbar| returns a handle. There's lots of options in there to set, and you'll find the one you wanted, too. ...

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Graphing in Cylindrical Coordinates using MATLAB
Advice is to make a start and show us what you have done so far. Here is my primer: r = 0:0.1:1; theta = linspace(0, ...

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Multidimensional Indices of Multiple pages
You could use linear indexing if you convert each row/column into a page start index, then take the page range.... g1 = r...

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Matlab display
In the top-right of the window (in the menu bar) you should see a little curved arrow pointing down and right. Click that and i...

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