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X = a strophoid x=a(t2-1)/(t2+1), y=at(t2-1)/(t2+1), a>0, t=[-a,a].how to build a curve y (x) on the specified view.(blue dotted with marker type square)
On your line 4. you left out a dot. You should have: y = a*t.*(-1+t.^2)./(1+t.^2); However this will only give you two...

10 years ago | 1

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Answered
problem with randsample when array with one element
That's what it is supposed to return. Read the website: http://www.mathworks.com/help/stats/randsample.html which stat...

10 years ago | 0

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Column size mismatch error using pdist2
You have taken the transpose of 'condition1oder2' which gives it 36 columns. That's a no-no for 'pdist2'.

10 years ago | 1

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How can I insert a row in the middle of a matrix/vector?
Suppose you want to insert the column vector y in the column vector x starting at index ix. x = [x(1:ix-1);y;x(ix,end)]; ...

10 years ago | 2

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How to write the equivalent of an 'until loop' in matlab?
To reproduce the equivalent of repeat --- until in C, do this: b = true; while b do the loop computations ...

10 years ago | 2

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Calculating mixed partial derivatives of a function A(x,y)
syms x y f(x,y) = x*sin(y); d2fdxdy = diff(diff(f,x),y); % = cos(y) Another way is: syms x y diff(x*sin(...

10 years ago | 1

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Please I need the codes to how I can solve a random linear system of size n x n, using the tic and toc statements to find how the Matlab linear solver scales with the problem size n.
The "n by n random linear system" you ask about refers to a random square matrix A of size n by n, a random column vector, b, of...

10 years ago | 0

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Replace a zeros row with one under a condition very important for me
I'll just answer for your "First one" in getting "the same thing for the columns in A". Let x be a column in A. s = cumsum...

10 years ago | 0

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How to analyze a distribution parameters?
I fail to see what the difficulty is here. If x is a vector containing all the values of the parameter in question, then y is a...

10 years ago | 1

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Hi, how do I compute f(x) = tan(x) at x=1 using the forward difference and the central difference. Using also h = 10^(-k), where k= 0,1,2,....,16.? I already did this but not too sure if it is correct.
You should beware of carrying out this computation as far as h = 10^(-16). Matlab's computation of 'tan' is only accurate to ab...

10 years ago | 0

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how to convert from column to row ?
B = A.';

10 years ago | 20

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Matlab Busy since four hours
Your method of appending columns to 'Result_matrix' is very time consuming. Also as Geoff points out, your creation of a new 'z...

10 years ago | 1

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function to calculate summation in matrix
Instead of inserting ones into a pre-existing A of zeros, it is easier to generate A from scratch: A = []; for k = 1:s...

10 years ago | 0

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Turn imaginary numbers to complex
Your statement *"my Eigen values (l) are not of the form alpha+beta*i"* really isn't correct. They are both of that form where ...

10 years ago | 0

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I am trying to create a program in MATLAB that uses a while-loop to calculate the product of the values of all the elements of A when A=[10,11,12,13,14,15,16,17,18,19]. So far I have the following program:
If you are required to use a loop rather than a vectorized method, you can do this: f = 10:19; product = 1; for k ...

10 years ago | 0

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Answered
I am trying to create a program in MATLAB that uses a while-loop to calculate the product of the values of all the elements of A when A=[10,11,12,13,14,15,16,17,18,19]. So far I have the following program:
Product of all the elements of [10,11,12,13,14,15,16,17,18,19]: p = prod((10:19);

10 years ago | 0

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Epsilon close solution to a trigonometrical system of equations.
The problem here is that you have more unknowns than equations. In such a case there is generally an infinite continuum of poss...

10 years ago | 0

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I do not understand why my k value won't increase to 3. Is there an error in my logic?
Your condition "del_z == lt*k" is too demanding. Your computer is using binary numbers to approximate decimal fractions. When ...

10 years ago | 0

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Answered
how to draw circle with different radii in scatter plot?
Let P1 = [x1,y1], P2 = (x2,y2), and P3 = [x3,y3] be your three points. Then, interpreting your word 'intercepts' as meaning tha...

10 years ago | 0

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I have a data set of 400 columns and 644rows .I need to select columns 1,2,11,12,21,22,.....381,382,391,392 or move these particular columns in to a matrix.how can i write code for this in matlab
If M is the matrix with 400 columns, and if M2 is the matrix to be obtained from it, do this: n = 400; M2 = M(:,mod((1...

10 years ago | 1

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Replace certain matrix values with zeroes (more complex than other similar questions)?
Let 'A' be your original matrix and 'G' be the goal matrix. m = size(A,1); n = sum(s); G = repmat(A,n,1); c = ...

10 years ago | 1

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Length of intersection segment.
This is the problem that led to the classical problem of elliptic integrals. However, you can solve your problem numerically us...

10 years ago | 1

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merging column elements into one
You can easily compress seconds, minutes, hours, days of the month, months, and years into one double precision floating point n...

10 years ago | 0

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How can I solve this equation and do not get RootOf in my answers?
There is a theorem in mathematics known as the Abel-Ruffini theorem that states that there is no explicit formula for general qu...

10 years ago | 1

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why matlab is unable to solve these set of equations?
My suggestion would be to help out Matlab's 'solve' a little by the way the problem is approached. The sixth, seventh, and eigh...

10 years ago | 2

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i have array cv which contains 16 rows & 2 columns. i need to find index of any one column. for ex, ans=2 or ans=1. i tried the following code. but it doesn't give the correct answer.please send the code.thank u sir.
I think what you meant to do is: ind = find(cv(:,z) == 2); % Gives indices of each element in column z which equals 2

10 years ago | 0

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Help with calculating median of an array without using built in function?
Next step: n = length(b); t = (n+1)/2; md = (b(floor(t))+b(ceil(t)))/2; % <-- median

10 years ago | 1

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Answered
Finding a variable in a equation
The following obtains a least squares value for K: K = y/(exp(x/25)-1); I am assuming x and y are still row vectors her...

10 years ago | 0

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How to get smith form of a matrix in matlab
Use 'smithform' only in mupad. See <http://www.mathworks.com/help/symbolic/mupad_ref/linalg-smithform.html>

10 years ago | 0

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Answered
Matrix Dimension must agree..
The error message is telling you what the trouble is. The vector x(i,:) has 1000 elements for each 'i', but p(i,:) was input an...

10 years ago | 0

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