Jon

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331 total contributions since 2013

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Answered
why is my plot plotting blank?
The reason your plot is blank is because all of your y values are infinite. They are infinite because Cd is zero for all of your...

6 days ago | 0

Answered
Numeric integration with Trapezoidal and Simpson's rule
You may have other problems too, but it looks like you clear all of your variables right after you just defined your limits and ...

6 days ago | 0

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this is the code that i want to run, but got problem Undefined function or variable 'QFix'
You need to make sure that the directory where the file QFix.m is located is put onto the MATLAB path. Click the Set Path icon ...

6 days ago | 0

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How to stop the for loop once the right input is given. Cannot use break.
You could loop with a while statement instead. Set the exit condition on the while statement to be that the answer was wrong or ...

7 days ago | 0

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finding value of matrix in an if statement
I'm not sure exactly what you are trying to do, but I will try to explain what your statement is doing and why it might not be w...

7 days ago | 0

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Incorrect Intersection Output of Two Lines
The main difficulty here is comparing Klaus and Hans heights at simultaneous times. Note that the elements of xh and xk are not ...

8 days ago | 0

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Only getting zero as my output for ode45
The "problem" is that x0 = 0 is an equilibrium point of your system dx/dt = 0 when x = 0. So if you start the system at x0 = 0 ...

8 days ago | 0

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Defining ODE function as function file
Looking briefly at your function definitions, it seems that maybe you are misunderstanding what this function is to compute. It ...

8 days ago | 0

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Transfer function to low or high pass
One way would be to make a Bode plot of the frequency response and determine does it gain go to zero at high frequencies or low ...

8 days ago | 0

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How do I get a loop to calculate for each value of a formula, not just the last n of the input(N)?
You must provide an array to hold your output force. You keep overwriting it with each loop iteration So, depending upon what y...

8 days ago | 0

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Answered
How do I vectorize a nested for loop with different sized steps?
I think you may be able to utilize the filter2 function for this purpose. For example A = [1 2 3 4;5 6 7 8;9 10 11 12;13 14 15 ...

11 days ago | 0

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Trying to find a minimum value
You may have some additional problems but one is that you reset wb to zero with every loop iteration, first line in your loop is...

11 days ago | 0

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Plotting sequences over intervals
You could do it like this n = -10:10 x = zeros(length(n),1) % preallocate array of zeros to hold result for k = 1:length(n) ...

12 days ago | 1

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Answered
Index in position 2 exceeds array bounds (must not exceed 1). Error in dlmread (line 159) result= result(:,1:ncols);
You may have other problems too, but I noticed that since i does not change inside of your loop, you always read from the same s...

12 days ago | 0

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optimising variables that are dependent on other variables
If you have the optimization toolbox then you can use fmincon to solve this type of problem. https://www.mathworks.com/help/opti...

12 days ago | 1

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Answered
Why is my plot not showing?
You need to use ./ Other wise you end up with just one value for f,g, and h x=linspace(-2,2,100); f=(3*x)./(9*x.^2+1) % ./ g=...

13 days ago | 1

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Answered
Plotting for specific values
plot(node,U(:,t==0.25),node,U(t==0.5)) % and so on

13 days ago | 0

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Problem using polyfit with NaN data
To avoid having NaN in polyfit I would use iFit = isfinite(Strain) c = polyfit(Strain(iFit),Load(iFit)) % ok to have NaN w...

13 days ago | 0

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Solve as Optimization Problem in Matlab
I think you can use the MILP mixed integer linear programming functionality if you have the optimization toolbox https://www.ma...

13 days ago | 0

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Plot / Solve system for nontrivial answer. dot operator issue?
I don't have the symbolic toolbox, but you can also solve this type of problem using fzero You need to write a little function ...

13 days ago | 1

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Using an external script/function in simulink "matlab function block"
Will the 1-D interpolation block do what you need? https://www.mathworks.com/help/simulink/slref/1dlookuptable.html

15 days ago | 0

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My code taking too much time
You can operate on the entire vector using for example a(a<1) = randn So you could make a loop something like while any(a<1) ...

15 days ago | 0

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Answered
How to perform xor operation on an three input binary bits.
The MATLAB function xor takes two input arguments and and provides and xor between the elements of each argument. So for exampl...

15 days ago | 1

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Automatically take folder directories of one level up
You can specify the full path to the directories you want to open rather than changing the directory that MATLAB is running in. ...

18 days ago | 0

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Multiply/divided two tables
% suppose you have a table T1 and T2 you could do something like A = [T1.myColumnName1 T1.myColumnName2] B = [T2.myColumnName...

18 days ago | 0

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How to unit test several different functions that take the same input arguments efficiently?
Here are a couple of possibilities You can pass function handles, and then make the function you are testing be one of the argu...

18 days ago | 0

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For loop data extraction
You overwrite your t and soln values with each loop iteration. If you want to save those to use them later you need to put them ...

19 days ago | 1

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How to read a specefic column of several xls file and create a matrix
The readmatrix function can be used to read in the.Use the range option to specify the column you want from each .xls file. Type...

19 days ago | 1

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Answered
Why do I keep getting this error message? Error using ./ Matrix dimensions must agree.
I can run your code without getting any error messages. Can you please be more specific about how to reproduce the error. Also w...

19 days ago | 0

Answered
How to format this Loop?
In your code above x and y are the same they are both assigned to Data(d,:) do you mean to have? x = Data(d,:); y ...

20 days ago | 0

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