Community Profile # bym

### NCSU

Attivo dal 2011

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

oltre 8 anni fa | 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...

circa 9 anni fa | 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 ...

circa 9 anni fa | 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>

oltre 9 anni fa | 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,...

oltre 9 anni fa | 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...

oltre 9 anni fa | 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 ./ ...

oltre 9 anni fa | 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(...

oltre 9 anni fa | 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 ...

circa 10 anni fa | 0

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

circa 10 anni fa | 0

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Vandermonde Matrix and an Error Vector
X = V\B

circa 10 anni fa | 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...

circa 10 anni fa | 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 ...

circa 10 anni fa | 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...

circa 10 anni fa | 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...

circa 10 anni fa | 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)) ...

circa 10 anni fa | 0

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

circa 10 anni fa | 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...

circa 10 anni fa | 0

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

circa 10 anni fa | 1

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

circa 10 anni fa | 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 ...

circa 10 anni fa | 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...

circa 10 anni fa | 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...

circa 10 anni fa | 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 ...

circa 10 anni fa | 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...

circa 10 anni fa | 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...

circa 10 anni fa | 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)

circa 10 anni fa | 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?

circa 10 anni fa | 0

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

circa 10 anni fa | 0