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Area of an equilateral triangle
Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

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Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

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Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

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Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

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Is my wife right?
Regardless of input, output the string 'yes'.

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

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Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

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Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

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How to plot the 4th dimension of an array?
Extract the 4th dimension first. fourthDimMatrix = allMatrix(:,:,4) Then try |plot| function

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how to take a value from matlab workspace
Try |fwrite| <http://www.mathworks.in/help/matlab/ref/serial.fwrite.html fwrite>

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i have 1000*1000 pixel image.how can i convert it into m*n(400*300) pixel image.
outputImage = imresize(inputImage,[400 300]);

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find position of the matrix
x(1), x(2) ... x(end), Gives you each every value in the array.

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how to do real image acquisition using webcam?
After Connecting Webcam with your computer, Just type |imaqtool| in your command window. Refresh the Hardware Browser to find yo...

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Use of the Pop-up menu in a GUI
get(handles.Vt_Callback,'Value') This returns the value. Try using: get(handles.Vt_Callback,'String')

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To Know the total number of pixels which belongs to one color
I = imread('peppers.png'); RedPlane = I(:,:,1); GreenPlane = I(:,:,2); BluePlane = I(:,:,3); This how you may extr...

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randomly access a file in matlab
Please specify the type of data you are reading from the current folder in this line. f = dir(['myfolder\*.jpg']); or an...

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Warning in reading data from serial port.
I'm trying to read a single character 'A' from serial port, But it is issuing a warning always. CharVar = fscanf(SerialObj,...

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Communication with PIC Microcontroller
I have designed a face recognition system. If the face is recognized, I'm sending a character |'a'| via serial port to microcont...

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How to assign classes for group of images in a classifier?
I'm developing a Finger knuckle print biometric system. For that I had extracted SIFT and SURF Features for the image. I am havi...

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How to match features
This |showMatchedFeatures| feature was available only in MATLAB R2013a and not in any lower versions.

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MATLAB R2013a is not installing.
I'm trying to install MATLAB R2013a. I'm getting error while installing. When I invoke the "setup.exe" program in the setup, it ...

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Creating a 2-D matrix from a 1-D Array?
Considering that I have an array of |A = [150 11 12 134 130 152]|. How to replicate these elements in this array to get a matri...

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How to draw this figure?
I have this figure. I have the color portion. That is they are surface plot that are visible from the top. Also I plotted those ...

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How to draw this figure?
I have these figures with the equation also shown. I tried making this. But I did not got the expected result. Please give me so...

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what is the formula used for Approximation quality metrics(measerr)?
I see a formula for the same in MATLAB help. <http://www.mathworks.in/help/wavelet/ref/measerr.html Try this.>

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