Community Profile # bym

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

plus de 8 ans il y a | 1

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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...

environ 9 ans il y a | 0

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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 ...

environ 9 ans il y a | 1

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

plus de 9 ans il y a | 0

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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,...

plus de 9 ans il y a | 0

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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...

plus de 9 ans il y a | 1

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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 ./ ...

plus de 9 ans il y a | 0

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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(...

plus de 9 ans il y a | 0

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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 ...

presque 10 ans il y a | 0

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

presque 10 ans il y a | 0

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Vandermonde Matrix and an Error Vector
X = V\B

presque 10 ans il y a | 0

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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...

presque 10 ans il y a | 0

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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 ...

presque 10 ans il y a | 0

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Don't define wn as symbolic vo=input('vo='); xo=input('xo='); wn=input('wn='); syms t; %syms wn; comment this...

presque 10 ans il y a | 0

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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...

presque 10 ans il y a | 0

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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)) ...

presque 10 ans il y a | 0

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

presque 10 ans il y a | 0

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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...

presque 10 ans il y a | 0

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%{ were you thinking of multiple lines of comments? (curly braces,not tildes) }%

presque 10 ans il y a | 1

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

presque 10 ans il y a | 0

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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 ...

presque 10 ans il y a | 0

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

presque 10 ans il y a | 1

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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...

presque 10 ans il y a | 0

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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 ...

presque 10 ans il y a | 1

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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...

presque 10 ans il y a | 1

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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...

presque 10 ans il y a | 0

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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)

presque 10 ans il y a | 0

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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?

presque 10 ans il y a | 0

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

presque 10 ans il y a | 0