# Jamie Al

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**Content Feed**

Question

performing linear regression fits using cftool based on data points

I want to use the MATLAB curve fitting tools (cftool) to prediction intervals (compute 95% prediction intervals about th linear ...

7 days ago | 1 answer | 0

### 1

answerQuestion

while loop results in NANs

I am solving non-linear poisson's equation iteratively using a mixed spectral method. The last iteration results in a NAN, I tra...

24 days ago | 0 answers | 0

### 0

answersQuestion

Iterative solver error: Index in position 2 exceeds array bounds

I am trying to solve a non-linear poisson equation iteratively and getting an error at the while loop. The code: Nx = 64; ...

30 days ago | 0 answers | 0

### 0

answersI am getting Error: Error using * Arguments must be 2-D, or at least one argument must be scalar.

So I was able to resolve this issue, by indexing in a very specific way: [X,Z,Y] = meshgrid(x,zgl,y); %now this is a Z-by-X-by-...

1 month ago | 0

| accepted

Question

I am getting Error: Error using * Arguments must be 2-D, or at least one argument must be scalar.

I have a 3D function where I am testing taking derivative along x,y, and z direction. My issue is that taking derivative wrt z i...

1 month ago | 1 answer | 0

### 1

answerQuestion

How to take fft along a specific direction?

I have this function that's periodic in x but non-periodic in y and I was able to perform fft along the periodic direction in th...

2 months ago | 1 answer | 0

### 1

answerQuestion

How to write Laplacian operator. Error: "Matrix dimensions must agree."

I am solving a 2D linear Poisson's equation. When taking first and second derivatives of my function I get correct results howev...

2 months ago | 0 answers | 0

### 0

answersQuestion

Animation using multiple frames/figures in for loop

I have the for loop that plots different frames of data, but I am trying to update all my frames in one figure to create an anim...

4 months ago | 1 answer | 0

### 1

answerQuestion

Movie function with subplots: error "Unrecognized method, property..."

I am trying to create an animation for different data frames, I keep getting the error: Unrecognized method, property, or field...

7 months ago | 1 answer | 0

### 1

answerQuestion

How to create animation of multiple of frames using for loop ?

I have the following code that plots text file data. However, here I chose few text files to represent and plot. I would like to...

7 months ago | 1 answer | 0

### 1

answerQuestion

Why am I getting: "invalid syntax at "(" .A might be missing a closing ")"

What is messing here?? source = ((-4*A^2*alpha)-(9*B^2*alpha))*(cos^2( (2*A) * XX).* sin^2( (3*B) * YY))... -( (5/2)*4...

7 months ago | 2 answers | 0

### 2

answersHow to load two text files and find the difference between them?

The answer is as stated by Ive J!

8 months ago | 0

| accepted

Question

How to load two text files and find the difference between them?

I have some text files with numerical data basically bunch of numbers that I am trying to compare between the two. I wanna subtr...

8 months ago | 1 answer | 0

### 1

answerQuestion

Why do I get "complex" arrays?

I am not supposed to get complex values but unfortunatley something is wrong in my eigenvalue caclultions. When plotting I get t...

1 year ago | 1 answer | 0

### 1

answerQuestion

Why Do I keep getting NaNs in my code???

I have posted the full code but I generally do not umderstand why??

1 year ago | 1 answer | 0

### 1

answerQuestion

How to save part of the data in text file?

I have the following plots at different time steps, I would like to save the data at the last time step in a text file. How can ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Help indexing: How to index at the interfaces of cells and not the cells

I am struggling to understand how to setup some indexing problem in MATLAB. If my entire domain is defined from 1 to N with a pa...

1 year ago | 2 answers | 0

### 2

answersQuestion

Unable to perform assignment because the size of the left side is 8-by-1 and the size of the right side is 8-by-1001.

I am getting this error where I am sure the size of the left-side = the right side in this code, what else can be causing this p...

1 year ago | 1 answer | 0

### 1

answerQuestion

Plot error: Index exceeds the number of array elements (104).

I am having the following error with plotting : Index exceeds the number of array elements (104). Error in MUSCL_main (line ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Error: Not enough input arguments

I have the following error in my Runge-Kutta (4 stage) function: Not enough input arguments. Error in RK4 for j = 2:N-1 % E...

1 year ago | 1 answer | 0

### 1

answerQuestion

Index in position 2 exceeds array bounds (must not exceed 1001)

I have the following code with the error: Index in position 2 exceeds array bounds (must not exceed 1001) my code dx = 0.001;...

1 year ago | 1 answer | 0

### 1

answerWarning: Imaginary parts of complex X and/or Y arguments ignored.

Thanks, but I found the error was a negative sign in a rooted term that needed an abs function to solve it.

1 year ago | 0

| accepted

Question

Warning: Imaginary parts of complex X and/or Y arguments ignored.

I keep getting this error messgae when plotting some quantaties. My code points out that U_T is a cmplex double which is not tr...

1 year ago | 1 answer | 0

### 1

answerQuestion

Root finder solver for cubic equation

I have the following cubic equation in beta, knowing gamma, theta and M1 how can I find the roots of beta using MATLAB? for...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to fit an exponential curve? error: Dimensions of arrays being concatenated are not consistent

Hello, I have an energy plot that I would like to fit an exponential curve to. I have something like this numSteps = 5000; x...

1 year ago | 1 answer | 0

### 1

answerQuestion

Array indices must be positive integers or logical values.

I am so confused why would I get this error. One minute the code is running fine and produces plots, the next is no longer runni...

1 year ago | 1 answer | 0

### 1

answerQuestion

Index exceeds the number of array elements (101)

I keep getting this error for a function I wrote. Not quiet sure what it really means since I think the sizes of xe and xb are c...

1 year ago | 1 answer | 0

### 1

answerQuestion

how to combine two plots in one figure

I have the following code and would like to plot the motion of a particle under the influence of magnetic field with two intensi...

1 year ago | 1 answer | 0

### 1

answerQuestion

3D Plot of 2D sim

I have the following code. The code works for me now and it provides a 2D plot, however I am trying to plot a 3D plot. So an exa...

1 year ago | 1 answer | 0

### 1

answerQuestion

Plotting 2D graph error: Index exceeds

Hello, I have the following code with some simple calculations, I am trying to plot eventually two plots: 1) Cpm/Rm VS T and 2)...

1 year ago | 1 answer | 0