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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...

11 years ago

Solved

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...

11 years ago

Solved

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...

11 years ago

Answered

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....

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....

11 years ago | 1

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Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 2

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Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 1

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Answered

How can I use MATLAB in image processing?

You can start here: <http://www.mathworks.com/products/image/examples.html>

How can I use MATLAB in image processing?

You can start here: <http://www.mathworks.com/products/image/examples.html>

11 years ago | 0

Answered

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 ...

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 ...

11 years ago | 3

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Answered

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 ...

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 ...

11 years ago | 0

Answered

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|...

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|...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 1

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Answered

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...

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...

11 years ago | 0

| accepted

Answered

Normalized distribution for histogram

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

Normalized distribution for histogram

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

11 years ago | 1

| accepted

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 1

| accepted

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

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Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 2

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Answered

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 ...

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 ...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

| accepted

Answered

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...

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...

11 years ago | 0

Answered

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...

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...

11 years ago | 0

| accepted

Answered

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...

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...

11 years ago | 1