Question

Defining boundary condition and initial condition for PDE.

I want to solve following 1D Burger's equation using pdepe. With the initial and boundary condition of 4. Unfortunately, I cou...

2 years ago | 0 answers | 0

Question

find the last non-zero value

For a regular vector we can use following command to extract the vector after pre-allocating. if m = [ 1 2 3 4 5 0 0 0 0...

4 years ago | 1 answer | 1

Answered

find the last non-zero column in matrix in pre-allocated matrix

Oh I see it can be answered by find(any(M,1),1,'last')

find the last non-zero column in matrix in pre-allocated matrix

Oh I see it can be answered by find(any(M,1),1,'last')

4 years ago | 0

Answered

find the last non-zero column in matrix in pre-allocated matrix

another way is to delete the zeros if m = [ 1 2 3 4 5 0 0 0 0 0 0 0 0] m(m==0)=[] m= [1 2 3 4 5]; However my question i...

find the last non-zero column in matrix in pre-allocated matrix

another way is to delete the zeros if m = [ 1 2 3 4 5 0 0 0 0 0 0 0 0] m(m==0)=[] m= [1 2 3 4 5]; However my question i...

4 years ago | 0

Question

calculate the inv of a matric with one constant

Hello all, I have a simple question. Assume that I have the following matrix. How can I find the inv of this matrix based on "t...

4 years ago | 1 answer | 0

Question

Preallocating zeros in cell array. and Which one is faster? 3D matrix, cell or structure data?

Hello all, I have to rewrite my Matlab code to make it faster. in some cases I need to used cell structure to keep my data: for...

5 years ago | 2 answers | 0

Question

find the last non-zero column in matrix in pre-allocated matrix

Hello, My matlab code is creating very very matrix and I didn't pre-allocate it before. Because I always need to know the size ...

5 years ago | 4 answers | 0

Question

Delet zeros after final number

Dear all, I'm looking for an efficient way to delete zeros after final number in MATLAB, A= [ 5 6 0 3 2 0 9 0 0 0 0 0 0] ...

5 years ago | 2 answers | 0

Answered

delete zero rows only with one number

if a = [9 0 0; 7 0 0; 8 2 0; 8 8 8] K>> t=a(all(a(:,2:end),2),:) t = 8 8 8 however it should be K>> t=a(a...

delete zero rows only with one number

if a = [9 0 0; 7 0 0; 8 2 0; 8 8 8] K>> t=a(all(a(:,2:end),2),:) t = 8 8 8 however it should be K>> t=a(a...

5 years ago | 0

Question

delete zero rows only with one number

Dear all, I have a matrix like A =[23 45 23 56;26 0 0 0;45 23 65 34;34 0 0 0] I want a very efficient way to delete only the r...

5 years ago | 4 answers | 0

Question

mesh generation for all known domain coordination

Hello, I'd like to generate a 3D mesh, for example, in my picture, if I calculate all points in a, h, f and c, how can I plot...

5 years ago | 0 answers | 0

Question

Arc length of Cubic Bezier Curve

Hello, I'm looking for an efficient way to calculate the arc length of Cubic Bezier curve, by knowing P0,P1,P2 and P3. Thank ...

5 years ago | 1 answer | 0

Question

Find the intersection of two vectors

I have two pairs of point and vector in 2d and I should find its intersection. for example: p0=[0,0] vector_p0=[0,1] and p1...

6 years ago | 1 answer | 0

Question

Plotting Beziar curve by having tangent

My problem: I have coordinate and tangent of first point and the end point of Bezier curve and I should draw Bezier Curve in MAT...

6 years ago | 0 answers | 0

Question

Plotting Bezier curve by having tangent

My problem: I have coordinate and tangent of first point and the end point of Bezier curve and I should draw Bezier Curve in MAT...

6 years ago | 0 answers | 0