# 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**

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...

1 hour ago | 0

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 ...

4 hours 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,...

4 hours ago | 0

I am trying to form a conditional loop that shows the growth of money, I put in $1000 every year and it grows by 85 for ten years but keep returning one value

format shortg n=10; money=[1000 zeros(1,n-1)]; supersaver=1000; for i=2:n money(i)=(money(i-1)+supersaver)*1.08; ...

3 days ago | 0

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...

3 days ago | 0

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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...

4 days 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...

11 days ago | 2

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'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') %%...

12 days ago | 0

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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. ...

13 days 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...

13 days ago | 0

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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...

14 days ago | 1

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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...

18 days 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...

18 days ago | 2

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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...

18 days ago | 1

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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 ...

18 days 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...

20 days 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...

20 days ago | 1

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cell配列をスカラー配列に直すにはどうすればいいですか？

I am not sure why you are using linspace here. You can use cellfun to calculate mean of each cell element - avg = cellfun(@me...

21 days ago | 1

Matlab is giving different answers for the same calculation

That's because the value of D_h is not 0.0019. The value stored is not the same as value displayed. rho = 916; %kg/m^3 ...

23 days ago | 2

インデックスが配列要素数を超えています。インデックスは 0 を超えてはなりません。

When kq is 0, the equation becomes 1==0, which is obviously not true, thus there is no solution for it. For that iteration, q1 i...

25 days ago | 1

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How can I change the decimal separator when exporting to Excel?

Try - T = readmatrix('filename.format', 'DecimalSeparator',',');

25 days ago | 0

How to get Bin Edges at specific Value point (Maximum value) in histogram.

load('Data.mat') H = histogram(DATA) %Get the index of the max value alongside [HMAX, idx] = max(H.Values,[],"all") %USe the...

25 days ago | 0

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Change specific colour in an image

The image is actually an indexed image with a colormap. Use the map to convert it to an rgb image via ind2rgb - %Read the file...

25 days ago | 0

xlabel do not appear in plot

Call the plot() command first and then define the labels and legend - syms x s u1 = stepfun(x,0); f1 = x.*exp(-3*x).*u1; ...

26 days ago | 1

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Why does my ode45 return a solution with the first values as zero despite I supplying non-zero initial conditions?

"Why does my ode45 return a solution with the first values as zero despite I supplying non-zero initial conditions?" Because yo...

26 days ago | 0

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How to make this type of variation plot in MATLAB

You are looking for errorbar.

27 days ago | 0

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Error using mesh - Z must be a matrix, not a scalar or vector, using mesh command

The difference between min(x1) and max(x1) is not 100, thus the vector x1fit generated via colon() is just min(x1). Consequently...

27 days ago | 0

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Getting an error message when I use 'triangle()' function.

That help is for a Stateflow operator in SIMULINK (as mentioned in the 1st line), not for a function in MATLAB. help triangle ...

29 days ago | 0

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I could not display all the legends related to the plotted bars

You get a single legend entry because there is only a single graphical object. If you want a separate legend for each bar, you ...

29 days ago | 0

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Finding an angle in a trigonometric function using 2 equations

As you are solving for beta, you have to define beta as a symbolic variable. Also, I have reduced the step size in x, as the va...

1 month ago | 1