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Aktiv seit 2011

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Beantwortet
linear system of equations
Your equations are not independent. The second is 2 times the first

fast 10 Jahre vor | 1

| akzeptiert

Beantwortet
Troubles with interaction problem
here is a partial answer, without using symbolic tool box...see my comment above and you should be able to adapt the code to wha...

mehr als 10 Jahre vor | 0

| akzeptiert

Beantwortet
Why is my Simpson's 3/8 code not producing the correct values?
your first loop should start at 2, second at 3, third at 4. Set end points for all loops at n-1. Make sure n is divisible by 3 ...

mehr als 10 Jahre vor | 1

Beantwortet
how to create customized curve ( only know the shape )
maybe this or similar would help <http://www.mathworks.com/matlabcentral/fileexchange/7173-grabit>

fast 11 Jahre vor | 0

Beantwortet
problem about ODE (Rayleigh-Plesset Equation) error in ode15s
check your call to ode15s [T,R] = ode15s('RP',[0 3e-8],[1e-6 70]); %your code what does the following give you? [T,...

fast 11 Jahre vor | 0

Beantwortet
Problem in reading data from Excel sheet and copying it in 2d array
reverse i & j ? %copying data from the Numeric array to P for i = 1: 1:1110 for j = 1: 1 : 6...

fast 11 Jahre vor | 1

| akzeptiert

Beantwortet
Issue with lsqcurvefit and langmuir type equation
see comments in revised code below myfun = @(x,xdata) (x(1)*x(2).*xdata)./(1+x(2).*xdata); %added elementwise operators ./ ...

fast 11 Jahre vor | 0

Beantwortet
how do i save looped output into 1 variable matrix
c=19; % D=[]; p = zeros(c,1); % preallocate for k=1:c; Z=[X(:,1),Y(:,1)]; p(k)=anova1(Z); %D=save(p) unecessary %X(...

fast 11 Jahre vor | 0

Beantwortet
Plese help me. Matlab 'while' loop. A set of data is given..?
x =[ 8, 10, 12, 14, 16] find(x>=11,1) ans = 3 *edit*----------------------------- x = 8 10 ...

fast 11 Jahre vor | 0

Beantwortet
Finding coefficients and constant for multivariable linear equation.
You don't have enough points. 4 points < 5 unknowns

fast 11 Jahre vor | 0

Beantwortet
Vandermonde Matrix and an Error Vector
X = V\B

fast 11 Jahre vor | 0

Beantwortet
gaussian histogram so that area is equal to one.
it does not make sense to me to have the number of bins equal to your length of data. The purpose of a histogram is to describe...

fast 11 Jahre vor | 0

Beantwortet
Is this code ok?It asked to plot function together with hold on...syms x y; t=-2:0.1:2 n=-2:0.1:2 x=2*sin(4*pi*t); y=2*sin(4*pi*n); plot(t,x,'r',n,y,'g'); hold on; title('function'); legend('x function', 'y function'); grid on;
* no need for syms x y * x & y are the same thing perhaps you meant y = 2*cos(4*pi*t)

fast 11 Jahre vor | 0

Beantwortet
error message using polyfit (nonlinear regression)
I think it is obvious from the message; you don't have a enough data points to fit the polynomial uniquely. Like fitting a line ...

fast 11 Jahre vor | 0

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Beantwortet
Error using mupadmex " MuPAD "
Don't define wn as symbolic vo=input('vo='); xo=input('xo='); wn=input('wn='); syms t; %syms wn; comment this...

fast 11 Jahre vor | 0

| akzeptiert

Beantwortet
Plot inside a "for" loop
Please see comments in code. I checked a couple of values and they agree with your excel table, but it is up to you to verify t...

fast 11 Jahre vor | 0

| akzeptiert

Beantwortet
finding the breakeven point
Are you sure your equation is right? Anyway here is an example with a modified equation: f = @(c) log((c-1)./log(1+c)) ...

fast 11 Jahre vor | 0

Beantwortet
sum(w) and ones(1,size(w,2))*w' results totally different numbers
try ones(size(w))*w.'

etwa 11 Jahre vor | 0

Beantwortet
Ttest problem with alpha
you do not need to pass 'Alpha' to the function, you are getting the error because you are trying to pass a string when it is ex...

etwa 11 Jahre vor | 0

| akzeptiert

Beantwortet
Cleaning-up Code With Comments
%{ were you thinking of multiple lines of comments? (curly braces,not tildes) }%

etwa 11 Jahre vor | 1

Beantwortet
Curve fitting to get gamma curve parameter
If you have the statistics toolbox, you can use: gamfit()

etwa 11 Jahre vor | 0

Beantwortet
to find area of parabola?
x=[7.8 8.25 8.55]; y=[0.96 0.99 0.94]; p=polyfit(x,y,2); %f=polyval(x,p); x & p should be reversed ...

etwa 11 Jahre vor | 0

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Beantwortet
Plot empties after using datetick
clc;clear; close all startDate = datenum('01-01-2009'); endDate = datenum('12-31-2009'); xData = linspace(startDa...

etwa 11 Jahre vor | 1

| akzeptiert

Beantwortet
How to plot in 4_D?
look at the documentation for slice by typing in the command window doc slice also, look at the documentation f...

etwa 11 Jahre vor | 0

Beantwortet
Simpson's Rule Illustration - How to create those parabolas?
here is what I have done <<http://snag.gy/cjsli.jpg>> clc;clear; close all x = linspace(0,4*pi); % create data ...

etwa 11 Jahre vor | 1

Beantwortet
How to solve max load of P in Matlab?
So, when I see a problem statement that says "solve the above system of equations" I think of formulating the equations in matri...

etwa 11 Jahre vor | 1

Beantwortet
Want to make linear fitting and plot both graph on the same curve
you are going to have to transform your data: x=[0;0.100000000000000;0.200000000000000;0.300000000000000;0.40000000000000...

etwa 11 Jahre vor | 0

| akzeptiert

Beantwortet
Solving for a data point
pt2pt1 = @(M)(((y+1)*M^2)/((y-1)*M^2+2))^(y/(y-1))*((y+1)/(2*y*M^2-(y-1)))^(1/(y-1))-.6925 fsolve(pt2pt1,2)

etwa 11 Jahre vor | 0

Beantwortet
Creating a for loop that adds a number to a letter
for insight into what is going on try char(1:99) does it look familiar to what you are getting?

etwa 11 Jahre vor | 0

Beantwortet
How to obtain values symbolically
alternative: c =sym(1:10) f = @(x) sum(c.*x.^(1:length(c)));

etwa 11 Jahre vor | 0

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