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Question

Matlab and Fortran Precision Issue

I am running a code in Matlab and fortran 90 but I get different results althought the codes are the same. Is this due to differ...

3 years ago | 3 answers | 0

### 3

answersQuestion

Mesh Grid of a 3d array

I want to plot the error when I compare a numerical approximation and an exact solution. I want to use the matlab mesh function ...

3 years ago | 1 answer | 0

### 1

answerQuestion

Plot a function of two variables

I want to plot the function sin(4*pi*x)*sin(4*pi*y). I tried the following but I am not sure if I am doing the right thing. Any...

3 years ago | 1 answer | 0

### 1

answerQuestion

Repeating entries of blkdiag

I created a block tridiagonal matrix sysytem using the code below. n = 4; A = [ 6 2 0; 3 6 2; 0 3 6]; B = 7*eye(3); D = 4...

4 years ago | 1 answer | 0

### 1

answerQuestion

How do I avoid using if and else statements in this code

I want to rewrite this code but without if and else statements. I just want to enhance convergence rate for i=1:N-1 for ...

4 years ago | 1 answer | 0

### 1

answerQuestion

How do i read the exact values from a textfile

I have a textfile that contains a vector of length 441. However when i use the fileread command, Matlab says the file has length...

4 years ago | 1 answer | 0

### 1

answerQuestion

How do I plot the value at each iteration?

My code below is to compute the minimum value and vector using the conjugate gradient method. How do i plot the value at each it...

4 years ago | 1 answer | 0

### 1

answerQuestion

Using ODE23s

In the code below, y1, y2 and y3 are functions of three variabes t, x and y. y1(0,x,y) = 1 and y2(0,x,y)=y3(0,x,y)=0 are the ini...

5 years ago | 0 answers | 0

### 0

answersQuestion

Using kron to create a large matrix

I wrote this code to create a block tridiagonal matrix with I (I is the identity matrix) on the sub-diagoanls and A as the squar...

5 years ago | 1 answer | 0

### 1

answerQuestion

121 by 121 Sparse Matrix

I want to create a sparse matrix (121 by 121) with A repeating in the main diagonal. I wrote a code below to create my 11 by 11...

5 years ago | 1 answer | 0

### 1

answerQuestion

Using dde23 with events option

Can someone kindly check this code for me? I can't seem to find my error. I can't plot the graph because my dimensions are uneq...

5 years ago | 1 answer | 0