# Lujain Almarhabi

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**Content Feed**

Question

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...

3 months 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??

3 months 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 ...

3 months 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...

3 months ago | 2 answers | 0

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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...

3 months 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 ...

3 months 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...

3 months 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;...

3 months 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.

3 months 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...

3 months 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...

5 months 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...

5 months 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...

5 months 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...

5 months 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...

6 months ago | 1 answer | 0

### 1

answerQuestion

3D Plot of particle trajectory in E and B field

I have the following code that solves Lorents equation using Boris method time integrator and it calculates the gyro radius and ...

6 months 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)...

6 months ago | 1 answer | 0

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answerQuestion

MATLAB: How can I change the size of a structure of arrays?

I have the following the structure of arrays: ray_state_vec_in2.r = ray_state_vec.r(:,[1:3]); ray_state_vec_in2.Q = ray_stat...

9 months ago | 1 answer | 0