David Hill

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3.469 total contributions since 2017

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Answered
How can I fix this Infinite While loop?
a = 12; b = 13000; x = .2004/a % Interest payment = 700;%I assume you want a constant payment until the last payment count=...

1 día ago | 0

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Why can't I calculate the definite integral?
F=vpa(F)

1 día ago | 0

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Answered
creating a matrix from 2 vectors and a function loop
[wheel_radius,nozzle_radius]=meshgrid(.12:.02:.3,.002:.001:.01); for k=1:numel(wheel_radius) power_output(k)=waterwheel_ge...

1 día ago | 0

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Answered
Could someone explain this straight line function?
It is point-slope form of a line. If the points are a=[x2, y2] and b=[x1, y1], then: m=(a(2)-b(2))/(a(1)-b(1));%slope func =@(...

6 días ago | 0

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How can I move the bars in a bar chart?
figure; bar_displacement=.25;%play with this until it is correct bar(x-bar_displacement,y); set(gca,'XTick', x);

7 días ago | 0

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ignore NaN values in loop
CC=[]; for i = 2:16 A = walknov(:,i); A = interpft(A(~isnan(A)), 100); if isempty(A) CC=[CC;nan(1,100)]; ...

7 días ago | 0

Answered
using for loop plotting problem help me
What are you trying to plot? f= @(x) 3*x.^5+7*sin(x).^2;%I doubt you want sind fd= @(x) 15*x.^4+7*sin(2*x).^2+3*x.^5+7*sin(x)...

8 días ago | 0

Answered
Conditional statements on array.
i=reshape(Input,12,[])'>100; Output=zeros(size(i)); for k=1:size(i,1) if nnz(i(k,:))>0 Output(k,:)=1; end ...

8 días ago | 1

Answered
what it does mean?
If the matrix 'index' indexed at (1,1) equals 1, then assign S1 =0 and S2 = 0. if index(1,1)==1 S1=0; S2=1; end

8 días ago | 0

Answered
for loop issue not all answer printing out
function T = InterestPayment(P,r) for n=1:10 A(n) = P*((r*(1+r)^n)/((1+r)^n-1)); end T= table ((1:10)',A', 'VariableN...

8 días ago | 0

Answered
How can I find the nonzero values in an cells array?.
Non_ceros=zeros(length(Index)); for i = 1 : length(Index) for j = 1 : length(Index) Non_ceros(i,j) = nnz(In...

8 días ago | 0

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Answered
wanna creat a matrix of unknowns and write some equations with those unknowns and then take the matrix of coefficients
syms a b c d; t=[a b;c d]; coef=[2 3]; eqn=dot(coef,t(1,:));

8 días ago | 0

Answered
for loop help - Newton's method
I would avoid symbolic unless you need to. f = [2,-6,-12,20,42,18]; df = polyder(f); tol=1e-10; error=1; x=[-2,4];%initial ...

8 días ago | 0

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Answered
store user input in an array
user_input= zeros(1,10); for i = 1:10 while user_input(i)<=0 user_input(i) = input('Enter positive real number : '); ...

8 días ago | 0

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How to convert binary bits of a vector, say m, after rotating it left by 1 bit, into decimal ?
m = [16; 10]; %use column vector a = fi(m, 0, 8, 0); b = bin(bitrol(a, 1)); c = bin2dec(b);

9 días ago | 0

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Answered
Generate random numbers in the second decimal point
x=1.198:0.1:2.198; x=x-(randi(6,size(x))+3)/100;

12 días ago | 1

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Answered
How to optimize the calculation of the mean between the elements of A and B efficiently?
C=(A+B)/2;

14 días ago | 0

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Answered
DOE points normal distrbution
m=standard_deviation.*randn(1,1000)+mean;%generates an array of 1000 numbers

15 días ago | 0

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Finding an unknown vector from three known vectors
syms x y z; C=[x,y,z]; A = [125 350 -80]; B = [-115 350 -80]; D = [-15 530 545]; eq1=norm(A-C)==300; eq2=norm(B-C)==300;...

15 días ago | 0

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Answered
Unable to concatenate the table variables 'Var1' and 'Var2', because their types are double and cell.
Why not just readmatrix? What column are you skipping? p = readmatrix('Arrone-pluviometro(36045)-2019-0-24'); p(isnan(p))=9999...

16 días ago | 0

Answered
Integrate definite integral with system of differential equations
Can you just do something like this? function dydt = odefun(t, y, c) dydt(1,:) = 1./(1+t.^2) ; % h(t) h=@(x)1./(1+x.^2); ...

16 días ago | 0

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Answered
How can I implement a loop to find the minimum among 5 values
Are you not allowed to use the min() function? function D = myfun(A) D=min([.1 3 5 8 12]./cumprod(A));

16 días ago | 0

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Using fzero on function
y=@(x)x.^6-2.*cos(x); x=linspace(-3,3,100); plot(x,y(x)); z(1)=fzero(y,-1); z(2)=fzero(y,1);

16 días ago | 0

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Answered
How to Define a Symbolic Continued Fraction
function L = continuedFraction(N,n) syms A B; if n==0 L=0; else L=1/(B/(N-1)+A/N+continuedFraction(N,n-1)); end R...

17 días ago | 1

Answered
FSOLVE with For loop
Not sure what values you what for b, but you will not to do a surf plot or plot3 (3d plot) f=@(x,b)x.^3.*b+exp(-b.^2)+x.*b-500;...

17 días ago | 0

Answered
Issue with creating a plot from two for loops
a=1.63279*10^-6; b=264.9889; T=373:10:1273; Mu = (a*T.^0.5)./(1+b./T); n = 0.666; T0 = 273; Mu0 = 1.375*10^-5; MuT = Mu0....

17 días ago | 1

Solved

Replace secondary diagonal elements of a square array
Replace all the secondary diagonal elements of the square array A with the number n Example: A = [1 2 3 4 5 6 ...

26 días ago

Solved

Compound interest - number e
A moneylender wants to receive his annual interest of 12% more frequently. If he receives his interest rate every six months,...

26 días ago

Solved

Double the next and alternate sign

26 días ago

Solved

Find the slope

26 días ago