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Using a variable in an input prompt
Another possibility you can use in recent releases of MATLAB (since I think release R2016a) is to use a string array. ii = 5; ...

1年以上前 | 0

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Compare char data in a cell {'x'} to a character 'x'
You've got a lot in here. I'm going to step through certain parts. Let's start off with this comment (formatting added, your wo...

1年以上前 | 0

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How do i multiply this matrix to work in MATLAB, it keeps sending an error
What did you expect to happen when you typed p. in your expression? That's not valid MATLAB syntax. If you had a number instead ...

1年以上前 | 0

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Changing the value of only one parameter causes a problem (possibly with while loop)
Let's look at the while loop. while (V(i) >= Vmax) D(i)=floor(20*(sqrt(4*Q(i)/(pi*Vmin))))/20; V(i)=Q(i)/(pi...

1年以上前 | 0

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Examples missing from requirements toolbox installation
I'm not 100% certain, but it looks like this page from the release R2022b documentation (the third entry under Topics in the Req...

1年以上前 | 0

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Duration of time values for separate datasets and plotting on x-axis
set0_time=["085440","091530","092000","093020","100000","100020","101325"]; set0 = set0_time; set0_ydata=[30 50 60 72 82 85 88...

1年以上前 | 0

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How can I bring back the command prompt in the command window after it disappeared ??? I cant execute commands !! if I press enter the commands disappear,
In the lower-left corner the status message says "Waiting for input". Does your code call the input function (perhaps with an em...

1年以上前 | 0

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How to reopen tabs for different projects
Sounds like you may want to create a MATLAB Project for each of your projects.

1年以上前 | 0

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Undefined function or variable 'aviread'. >> aviread('traffic.avi'); Undefined function or variable 'aviread'.
There used to be an aviread function in MATLAB, but I believe it was removed sometime around release R2014b. The recommended rep...

1年以上前 | 1

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how i can show in matlab tha sqrt(x^2)=x in symbolic toolbox
That's not true in the general case. A = 1; h0 = 1; dhmax = 2; B = -5; lhs = ((2*A*dhmax + B*h0)^2/h0^2)^(1/2) rhs = (2*A*...

1年以上前 | 1

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An absolutely ascending sequence
Those who have said there is no function for this are incorrect. The issorted function allows you to ask if an array is sorted a...

1年以上前 | 4

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Strange case of Code analyzer and if-else block
It’s rather obvious that only one of the blocks will execute, and it seems redundant for the analyzer to flag this. In this cir...

1年以上前 | 0

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The rotation in the rectangle function in matlab cannot be used, but the 2022 version can be used.
try rectangle('Position',[1 2 5 6],'Rotation',45); catch ME fprintf("This command threw the following error:\n%s", ME...

1年以上前 | 0

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How can I fix ODE45 returning a straight line when using specific `tspan` points, instead of showing dynamic behavior over the time range?
Your ode_LR function is defined to accept four input arguments, the two required arguments plus two additional parameters. func...

1年以上前 | 0

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error running getting started code
If you're using this matrix: a = [1 3 5 2 4 6 7 8 9]; the warning is correct. The matrix y...

1年以上前 | 0

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Using "unique" to identify unique values AND number of occurrences of each unique value
Use the groupcounts function. A = {'AGAP001076-RD' 282 0.67229 'AGAP001076-RD' 285 0.75292 'AGAP001076-RD' 286 0.66957 'AGAP...

1年以上前 | 0

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Having trouble printing variables I use as inputs to a function.
Let's look at a few selected lines of your code. The only variable that gets displayed with NaN values is uvwAndrSol so let's fo...

1年以上前 | 0

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No matter the NOA matrix I enter, the result I receive is "empty double column vector" and I want to receive a numerical value.
Let's look at the last column of your two matrices. syms phi_a phi_o phi_n %Rotation in a T_a = [cosd(phi_a), -sind(phi_a), 0...

1年以上前 | 0

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How to convert a function handle to symbolic function?
Are you hoping to use this fit object as the right-hand side of a differential equation ? If so keep in mind that fit objects ha...

1年以上前 | 1

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bitshift in matlab vs ishft in fortran
Instead of using bit operations yourself, why not just use typecast? t = 'int32'; x = randi([intmin(t), intmax(t)], 1, 2, t) %...

1年以上前 | 0

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N-dimension curve fit how to
See the Multiple Regression section on this documentation page. While that example only uses the first power of each of the vari...

1年以上前 | 0

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Is there a meaningful guideline on when to use parentheses vs square brackets vs curly brackets in writing MatLab code?
Parentheses Generally speaking, using parentheses to index into a variable usually does one of two things. If the variable is ...

1年以上前 | 2

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How do I print a % character into a file
If you don't need str inside your code other than to write it to the file, rather than creating it just write directly to the fi...

1年以上前 | 1

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Why do we get MATLAB fatal errors saying “Access violation detected”?
Please contact Technical Support directly using this link. Send any crash log files to Support and work with them to determine t...

1年以上前 | 0

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Why is 0.3 - 0.2 - 0.1 not equal to zero?
Starting in release R2024b, you can use the isapprox function to determine if two values are approximately equal to within a tol...

1年以上前 | 1

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Colon operands must be real scalars
For the expression you gave there are a few possible "reasonable" solutions for what it returns. [But it may not do what you thi...

1年以上前 | 0

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Heatmap doesn't show the values
Let's check that you're using the heatmap function included in MATLAB and not a different heatmap.m that you've written yourself...

1年以上前 | 2

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Some indices in indexed images made with cmunique are 0, what does that really mean? Isn't is a bug? I cannot index a colormap with index=0. Documentation is contradictory.
0 is a nonnegative integer value. isZeroNegative = 0 < 0 % false isZeroInteger = 0 == round(0) % true If you're using Imfig_i...

1年以上前 | 0

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assign the fields of a structure correctly
Is d1 a struct array whose fields you need to rearrange? d1 = dir(which('bench.m')) If so you can use orderfields. I'm going t...

1年以上前 | 0

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Differenece between "MATLAB for the MathWorks Certified MATLAB Associate Exam" and "MATLAB Fundamentals"
If you click "Learn More" in the "This course will be discontinued" banner on that course, it suggests the "Build MATLAB Profici...

1年以上前 | 0