# Ismita

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Question

Solution of nonlinear equation is different for different initial values

I have two codes. The first one is for two equations and the 2nd one is for 5 equations. the first one is giving the perfect res...

2 months ago | 1 answer | 0

### 1

answerQuestion

Matlab showing 0 instead of small value

In the following code delta_rho_m, delta_p_m (=(mass_density_CGS - mean(mass_density_CGS))) are very small, and delta_p_m is sho...

2 months ago | 1 answer | 0

### 1

answerQuestion

Solving nonlinear equations using matrix

I have p11 X1 + p12 X2 + p13 X3 + (-sin(psi) cos(X5) cos(X6) + cos(psi) sin(X5)) X4 &= C_1 (i) ; p21 X1 + p22 X2 + p23 X3 +...

2 months ago | 1 answer | 0

### 1

answerQuestion

Solving large number of equations

I am having issues to solve like following equations. I request for help/ suggestion to solve this type of equations. Thanks! s...

2 months ago | 2 answers | 0

### 2

answersQuestion

cosd() giving similar value for different angles

I have the following code. Though latitude(i) and longitude(i) have different values in degree, Ut and Un are giving the same va...

3 months ago | 1 answer | 0

### 1

answerQuestion

Solving multiple equations with constants like c_i

I request for help/ any suggestions. I need to solve for X1, X2, X3, X4, X5, X6, X7, X8 eq1(i) = p_11*X1 + p_12*X2 + p_13*X3 +...

3 months ago | 1 answer | 0

### 1

answerQuestion

Why eigen vector looks different than the calculated one

I have a matrix A = [7, 3; 3, -1]; Calculated eigen value = (-2, 8) and eigen vcetor = (1, -3). The code gives different eigen v...

3 months ago | 1 answer | 0

### 1

answerQuestion

Unit vector from the vector

mean_speed_R, mean_speed_T and mean_speed_N are the components of mean_U0_vector. How should I express the unit vectors along R,...

3 months ago | 1 answer | 0

### 1

answerhow to solve if interpolated data also contains NaN values

Thank you. In the attached file of the data, last column is for long and second last column is for lat.

3 months ago | 0

Question

how to solve if interpolated data also contains NaN values

I was trying to interpolate 'lat' and 'long' columns but even after interpolation first 4 data are still showing as NaN. For oth...

3 months ago | 1 answer | 0

### 1

answerQuestion

Writing unit vector with the terms in an equation

unit_y_vector = (mean_speed_T * mean_speed_N)/(magnitude_U0_mean_RTN)^2 - (mean_speed_R * mean_speed_T)/(magnitude_U0_mean_RTN)^...

3 months ago | 1 answer | 0

### 1

answerQuestion

Solving equations using Newton-Raphson method for 7 equations with 7 variables

I need to solve "PX_i = C_i" (i = 1,2,...7) using Newton-Raphson method. I have written the code in two files. One is unction an...

3 months ago | 2 answers | 0

### 2

answersQuestion

How to make a sequence of time and the corresponding data from a data set where time is not provided sequentially

I have some time series data for velocity, density for 30 mins time gap. But when I plotted, I see the time overlaps. How can I ...

3 months ago | 1 answer | 0

### 1

answerQuestion

To find angular frequency and wave vector for time series data

if I have 10 set of time series data velocity componnts Vx, Vy and Vz with 5 minutes interval of time, how to find the angular f...

3 months ago | 1 answer | 0

### 1

answerQuestion

Dealing data with text and numerical in .txt file

I have a txt file containing some data as follows: how to visualize using Matlab? I request your suggestions. "k: 0.1, omega_re...

3 months ago | 3 answers | 0

### 3

answersQuestion

Drawing a line through the peak of the plot

I have a plot as follows. How can I add vertical lines through the peak points (total 3 lines here) in the plot ? Code: I h...

1 year ago | 1 answer | 0

### 1

answerQuestion

Location of a value in a matrix

Say, I have a matrix x = 0:0.5:20. How can I find the exact location (according to the array) of the value of x==9.5? thanks

1 year ago | 2 answers | 0

### 2

answersQuestion

polar plot of n^2 = 1+g equation

polar plot of n^2 = 1+g (g=a/b~10^4) and/ or p^2 = (1-g)/( (1+g)*cos^2(theta)) equations and how can I get a circle from this eq...

1 year ago | 1 answer | 0

### 1

answerQuestion

selection of one parameter for correlation coefficient

Suppose, I have 100 rows of P and Q, and 20 rows of data make a group. Average of each group gives new set of data points (tota...

2 years ago | 1 answer | 0

### 1

answerQuestion

time date to datenum and datenum to datetime

I have time in 'yyyy-MM-dd''T''HH:mm:ss.SSS''Z' formate (e.g., [2018-08-01T20:05:00.000Z; 2018-08-01T20:10:00.000Z; 2018-08-01T...

2 years ago | 3 answers | 0

### 3

answersQuestion

Group making from large data size

How to make group of 10 row and mean of those 10 rows, then to calculate fluctuation of each gruop member from their correspond...

2 years ago | 2 answers | 0

### 2

answersQuestion

I tried Hampel filtering to discard the bad data, but it was not fruitful. How to avoid/filter

Dear all, I have attached the data plot. I tried Hampel filtering to discard the bad data, but it was not fruitful. How to avoi...

2 years ago | 0 answers | 0

### 0

answersQuestion

while writing txt file variables/data are shown in one column instead of being different column

Dear all, While writing a txt file of dataset, though in work space I see output like L(as I need) but in the txt file, it show...

2 years ago | 1 answer | 0

### 1

answerQuestion

I have data in seconds of each year, how to make continuous data for few years to plot as variable (Vx, Vy) Vs year

I have data in seconds of each year, how to make continuous data for few years to plot variable (Vx, Vy) Vs year. Here some data...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to make time string from seconds of each year (total 11 years) to year (for 11 years)

Dear all, I have a time series data set from 2008 to 2019. Where 1st column is for year and 2nd column (time interval is 300 se...

2 years ago | 1 answer | 0

### 1

answerQuestion

how to calculate first n terms of the sawtooth Fourier series and plot the results in figure?

2 years ago | 0 answers | 0