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Extract leading non-zero digit
<http://en.wikipedia.org/wiki/Benford%27s_law Benford's Law> states that the distribution of leading digits is not random. This...

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Make a Palindrome Number
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...

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QWERTY coordinates
Given a lowercase letter or a digit as input, return the row where that letter appears on a <http://en.wikipedia.org/wiki/Keyboa...

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How can I overlay a google earth image with a quiver plot?
If you have a map image of your area of interest, you could plot and scale the map coordinates using the |<http://www.mathworks....

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dB scale (log scale) of a polar plot graph
You can simply convert the results directly to the decibels scale and plot the transformed results using the |polar| function. I...

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FFT Power units for a time series?
Commonly, you can express the y-axis units in terms of power/frequency. If you use the logarithmic decibel scale, the units of y...

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FPLOT, how to define step size along X-axis?
To define your own points, you could just use the |<http://www.mathworks.com/help/matlab/ref/feval.html feval>| function. You co...

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Solving for unknown iteratively, guess and check
Perhaps a better way of formulating the problem is to solve for the zeros of the nonlinear function. F - a*(b*sqrt(c*(1 - x/d...

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Plotyy Display Gridlines Axis
You can select the second axis handle for the data plotted with respect to the right y-axis. If you define an output for the |pl...

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How can I use MATLAB in image processing?
You can start here: <http://www.mathworks.com/products/image/examples.html>

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How count pulse when go up in simulink?
One potential method for counting pulses is to use the <http://www.mathworks.com/help/simulink/slref/detectincrease.html Detect ...

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How can I convert a transfer function into time dependent using ilaplace
The |<http://www.mathworks.com/help/symbolic/ilaplace.html ilaplace>| function works on *symbolic expressions* and not transfer ...

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Plotting temperature contours from txt file
To help you get started, I found some examples in the documentation about interpolation of data using the |scatteredInterpolant|...

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How can I generate probabilities from a logistic regression?
If you have the Statistics Toolbox, you can fit a logistic regression with |mnrfit| function and then estimate probabilities usi...

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how to simulate a markov chain?
From what I gather from you description, this question has already been answered: <http://www.mathworks.com/matlabcentral/ans...

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How to Mask the Area other than sky?
One potential method for masking the building in your image is to detect the building edges via the |edge| function. Once you ha...

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Is there a matlab function that calculates joint probability for more than 2 random variables ("histc" for more than 3 rvs)?
If you are dealing with discrete random variables, you really only need to use the |accumarray| function. Here is an example...

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Plotting time-course of matrix entries
Extra credit time! Depending on how you want to ultimately display your results, you have quite a few options. For a quick and d...

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Normalized distribution for histogram
If you have the Statistics Toolbox, you might find the |dfittool| distribution fitting tool quite useful. doc dfittool I...

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How can i get the surface plot of 3 variables
You could use the |plot3| command to visualize the data that you have as a single line in 3d space. To use the |surf| or |mes...

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How to plot the frequency spectrum in simulink
By default, the "Power Spectral Density" (PSD) block is set to have a sample time of Ts = 0.1 seconds. You should open the PSD b...

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Test trained NARX neural network with new external input
Here is an example from the Neural Network toolbox documentation that you might find helpful: * <http://www.mathworks.com/hel...

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Undefined function or method 'markers2' for input arguments of type 'double'
You're calling a function, |markers2|. Since this is not a standard MATLAB function, you should have a file in your directory na...

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read .img format image without header file
You could directly read the *.img file directly into the MATLAB workspace via the |fopen| and |fread| commands. Since you do not...

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How to choose initial component parameters with gmdistribution.fit ?
Once you have clustered your data via the k-means algorithm, you can definitely use the cluster centers as initial conditions fo...

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what is the default amplitude value of the input signal when matlab gives the frequency response with fuction bode ?
Good question! The magnitude Bode plot depicts only the *relative gain* between two signals. Likewise, the phase plot gives you ...

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Handwritten digit recognition using Neural networks; How to configure for 2-D input?
Specifying an image as a column vector does not eliminate the adjacency information. As the column of pixels repeats at a regula...

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How to use the trained network to predict future values?
Once you have trained a network, you can use your net as a function. In your case, the outputs of the neural network could be fo...

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Show value on the root locus plot without using the Data Cursor
The |rlocus| function can output the complex root locations and the corresponding gains. You can manually plot these values to r...

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PNG and BMP images with imag(image) = 0. Why and how do I get something that makes sense/a nonzero answer?
You are using the |imag| function that returns the imaginary part of the function input. The function input in your case will ha...

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