# Dyuman Joshi

Mechanical Engineer IITG-20 | Moderator - MATLAB Cody since Jan 2021 | Time zone - IST (GMT +5.30)

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Python, MATLAB

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English, Hindi

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Fluid Dynamics, Aerospace Engineering, Computational Fluid Dynamics (CFD), Hydraulics and Pneumatics

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**Feeds**

Why I am not getting the same result for an integral of a piecewise function?

1 - It should be aux1 - (aux2 + aux3) 2 - The function is not vectorized properly, which provides incorrect results. I have mod...

20 days ago | 0

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array generation using logics.

x = [0 10 20 30 0 10 20 30 40 0 10 20 30 40 50 0 10] y = x; idx = [1 find(diff(x)~=10)+1 numel(x)] for k=1:numel(idx)...

20 days ago | 0

How programmatically create an array from variable-length vectors?

Here's a method to import data from a sequence of files - %Read all the mat files in the directory Files = dir('*.mat'); %...

20 days ago | 0

How to substitute a variable into a syms function?

Define the variable as a symbolic variable and then substitute - syms Vpo Von Dp Dn ws Lp Cps Ll Lm Vsecm Isec_real Isec_imag ...

21 days ago | 0

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How do I change the format of symbolic output

Change the symbolic preference of Type-setting as follows - syms x y sol = solve(y-x^2,x) %Preference changed (Default v...

21 days ago | 0

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Turn sequence into a loop

A better approach would be to vectorize, see below. (I assume all the arrays to be used have compatible dimensions for operation...

21 days ago | 0

如何得到361x91数组中重复最大值的位置

Use find - %Sample data mat = magic(4); mat = [mat; 1 4 9 16] %Get the maximum value val = max(mat, [], 'all') %% Find th...

1 month ago | 1

| accepted

Read text file line by line to columns

Use readmatrix (available from R2019a onwards) to read the data and transform it as per need - in = readmatrix('RANCHOD - Copy...

1 month ago | 2

行列の要素数を変更し、それぞれを違う行列として表示するにはどうすればよいですか

Preallocate a cell array, define each cell element accordingly and use indexing to access the data - %Number of arrays n = 10...

2 months ago | 0

Where can I find the documentation for polling methods applicable to paretosearch?

From the User's Guide of Global Optimization Toolbox, available here - https://in.mathworks.com/help/pdf_doc/gads/index.html (Pa...

2 months ago | 0

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Subs does not work in my code.

You can vectorize operations in the code - function [sMnew] = Cubic(k,M) n = 3*k+1; x = sym('x'); c = sym( 'c', [1 M+3]); ...

2 months ago | 0

Randomly giving "ans" value but i dont want that

"How can i prevent the creation of the "ans" ?" When calling a function with multiple outputs without specifying the outputs, o...

2 months ago | 1

How to plot points with corresponding colour

(Assuming there are only red and blue colors for the plot) Use logical indexing - %Check which elements of B are red idx = str...

2 months ago | 1

| accepted

使用limit函数求极限提示不允许不同类型之间赋值，怎么解决？

I scrolled across the image - jie is already defined as a struct (possibly in the code before this particular lines), thus you c...

2 months ago | 0

| accepted

How can I plot graph with lines of different color each using for loop?

You are over-writing the figure in each iteration, thus you only get the plot for a single iteration (i.e. the last one). Call ...

2 months ago | 0

How to create random sequence?

Use randn to generate the sequences and modify it accordingly - avg = 817e-9; sd = 10e-9; N = 50; seq = avg + sd*randn(1,...

2 months ago | 0

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I need to make a function for compound interest using for

In case you want the final output - format shortg money=1000; for k=1:10 money=money*1.08; end money In case you w...

2 months ago | 0

| accepted

How to extract data from a 3D Array?

Use logical indexing - %Sample data p = 5; q = 6; r = 4; y = rand(p,q,r)-1; y(:, :, [2 r+1]) = zeros(p,q,2) %Check i...

2 months ago | 1

for構文

That is because you are overwriting the files in each iteration of the for loop. Pre-allocate the output to assign data to it a...

2 months ago | 2

| accepted

'입력 인수가 부족합니다' 이 오류를 해결하고 싶어요.

I have made some changes to your code, please check the code below and refer to the comments for information - syms('x') %%...

2 months ago | 0

| accepted

Versions de Matlab compatibles Windows 11 et versions non recommandées pour Windows 11

MATLAB was introduced in Windows 11 from R2021b onwards. So, any versions before it i.e. R2021a or earlier, won't work on it. ...

2 months ago | 0

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Combining excel files with unequal rows

Try outerjoin - %Data from the images attached for example %Use readtable() to read the data as tables directly Name = ["Ada...

2 months ago | 0

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What is the last day of support for a MATLAB release (EOL - End of Life)?

This is not a good answer, @MathWorks Support Team - It's like saying pi is the ratio of circumference and diameter, when the qu...

2 months ago | 0

複素数の事前割り当て

You can use this syntax of zeros() to preallocate the data as a complex array -https://in.mathworks.com/help/matlab/ref/zeros.ht...

2 months ago | 1

| accepted

How to find the frequency of individual elements in a matrix?

MATLAB has a in-built function for it - histogram, which does both the operations in single command - s = load('micro2d (2).ma...

2 months ago | 0

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Assumption on another symbolic Variable affecting a previous assumption

Because assume over-writes assumptions. From the Tips section in the documentation page - "assume removes any assumptions pr...

3 months ago | 2

| accepted

MATLAB Grader: What should my assessment return when it determines a student solution is correct or incorrect?

You can use assert to check a condition (whether the title contains a particular text or not) and throw a (custom defined) error...

3 months ago | 1

| accepted

To find answer using matlabfunction

You get the wrong value because the order of inputs is not correct. By default, matlabFunction uses alphabetical order for the ...

3 months ago | 0

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convert a .mat to excel file

(Assuming single data set in each file) Read the data from the files and use writematrix to save the data in excel files accord...

3 months ago | 0

Matlab cannot recognize variable

"Why is Lambda unrecognized here?" Because the while loop is not initiated, as the condition is not satisfied. As the while lo...

3 months ago | 1

| accepted