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# Rachel Dawn

Last seen: 4 månader ago Active since 2018

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Question

How to generate a matrix of random decimal values from -1 to 1?
I want to generate a 8x10 matrix full of random decimal values from -1 to 1, each with EXACTLY 6 decimal places (i.e 0.523483, -...

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Question

Error using dacefit: Mulltiple design sites are not allowed
Training a kriging model but I get the error listed in the title. xTrain is a 750x8 double, so 8 design variables [x1 x2 x3....

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Question

How to use kriging model with images (pixels)?
I have 1000 images and the pixel data for each of these images (64x128). I want to create a krigging model with the x values as ...

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Question

"99 line topology optimization code" why does it take so long for a 64x128 matrix?
I'm running the 99 line topology optimization code with different nelx and nely values. like 20x32, 50x60, etc. It all runs fast...

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Question

How to convert "64x128 single" into "64x128 double"?
I imported an array from python with this shape: (5, 25, 64, 128, 1) It's 5 sets of 25 images that are 64x128. I tried plotting ...

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Question

MATLAB FEA code to measure the compliance of a topology image?
I'm wondering if there's some code out there that can measure the compliance of a topology image like this one: the images we...

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How to define multiple constraints for fmincon?
Hi, I'm trying to minimize the formula below. I've done most of the code except I can't quite figure out how to account for the ...

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Question

How to convert a matrix into a vector that has each row as an array?
For example, say that I have this matrix: [a b c d; e f g h; i j k l] To use in python (and to save as .npy), I need the foll...

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Question

Error when calling a jupyter notebook file from matlab
So, I'm trying to run a jupyter notebook file from a matlab script: status = system("runipy K-meansCBeam.ipynb") *runipy i...

ungefär ett år ago | 1 answer | 0

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Question

How can I run a jupyter notebook script from matlab?
I already tried running matlab from jupyter using Oct2Py but it didn't work (error after error). So, I'm wondering if I can use...

ungefär ett år ago | 1 answer | 0

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Question

How to convert image file name "1.jpg" into a string or # in a list, list= [1]
SIMPLE QUESTION: How to convert a image file name "1.jpg" into a string or # "1"? Ignore what's below (unless you have the time...

ungefär ett år ago | 1 answer | 0

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Question

How to save images from for loop to use for machine learning algorithm?
I have a for loop that generates a different image each time it loops. I want to save each of these images to input them into a...

ungefär ett år ago | 1 answer | 0

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Question

How to save each image generated in a for loop?
for i=1:20 volume=randi([2 10], 1,1) location=randi([10 100], 1, 1) imagegenerator(volume,location) end ^...

ungefär ett år ago | 2 answers | 0

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Question

numdesigns=5 nelx=30; nely=30; for i=1:numdesigns volfrac=round((.3+(.8-.3)*rand(1,1)),1); %random # from .3 to .8 ...

mer än ett år ago | 1 answer | 0

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Question

How to automatically add/subtract lines of code into a matlab function for several iterations?
So, I have this topology optimization function (models a beam problem with supports/loads on it). It takes 5 input variables a...

mer än ett år ago | 0 answers | 0

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Question

How to fit a lorentzian function to this raw data?
My research mentor asked if I could help him curve fit the Lorentzian to some raw data. Disclaimers: 1) I have no experience wi...

nästan 3 år ago | 0 answers | 0

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Question

Simpson's Rule to find total work
If I'm given time=[0,#,#,#,#,#] and velocity=[#,#,#,#,#,#] and Force=[#,#,#,#,#,#], how could I use Simpson's rule to find t...

nästan 4 år ago | 0 answers | 0

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Question

Trapezoidal rule to find total work?
I'm given 6 values for time, Force, and velocity. And I'm told to find total work with trapezoidal rule. (first time value is ze...

nästan 4 år ago | 1 answer | 0

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Question

Least squares Exponential fit using polyfit
Let's say I'm given x=[11,60,150,200] and y=[800,500,400,90] These are just random numbers (but imagine the solution is in the ...

nästan 4 år ago | 1 answer | 0

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Question

Why can't I put two equations in one function file?
function a,b=myfunction(x) a= @(x) 5-5*exp((1/3)*x) + (16- x^2)^(1/2) b= @(x) (-5/3)*exp((1/3)*x) - (16- x^2)^(-1/2) ...

nästan 4 år ago | 1 answer | 0

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Question

So, I wrote code for a function to find its roots using the bisection method. I used initial guesses x=4 and 6, knowing that the...

nästan 4 år ago | 1 answer | 0

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false position method to find zeros, not plotting zeros
Can someone tell me why this code is not finding/ plotting the roots for my function? I created a plot for function. Then, I wr...

nästan 4 år ago | 0 answers | 0

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Question

function that accepts vector
Can someone explain why I must use ".^" in the first function but then ".*" in the second? (for both to accept vectors and scala...

nästan 4 år ago | 0 answers | 0

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Question

Function won't accept vector
function result = g(x) result= (2*x*exp(cos(6*x))*exp(-x)) + 15 " Error using * Inner matrix dimensions must agree." ...

nästan 4 år ago | 2 answers | 0

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Question

bisection method error between approximation and actual root
Does anyone know what this question is asking? "How many iterations of the bisection would be needed to ensure that the error b...

nästan 4 år ago | 1 answer | 0

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Question

subscript indices error with function file (bisection method)
function result=guess(x) xleft=x(1,1); xright=x(1,2); f(x)= x.^3 - 4.9*x.^2 +6.76*x-2.013 if f(xleft)*f(xright)<0 ...

nästan 4 år ago | 2 answers | 0

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Question

Determine if valid initial guess for closed numerical method
If I'm given a function f(x), how can I determine whether say [0 1] or [1,2 ] are valid initial guesses for a closed numerical m...

nästan 4 år ago | 1 answer | 0

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How can I tell if this is stored as a vector?
Wow, thank you so much! I wouldn't have thought it would be as simple as taking off a semicolon & the output argument. I thought...

nästan 4 år ago | 0

Question

Sum of row and column #?
Say I ask the user to input the size of a square matrices, n. And say I want each element of this matrix to be the sum of the...

nästan 4 år ago | 4 answers | 0