Community Profile # bym

### NCSU

Active since 2011

#### Statistics

All
• • • • • • • #### Content Feed

View by

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

ongeveer 8 jaar ago | 1

| accepted

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...

meer dan 8 jaar ago | 0

| accepted

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 ...

meer dan 8 jaar ago | 1

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

ongeveer 9 jaar ago | 0

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,...

ongeveer 9 jaar ago | 0

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...

ongeveer 9 jaar ago | 1

| accepted

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 ./ ...

meer dan 9 jaar ago | 0

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(...

meer dan 9 jaar ago | 0

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 ...

meer dan 9 jaar ago | 0

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

meer dan 9 jaar ago | 0

Vandermonde Matrix and an Error Vector
X = V\B

meer dan 9 jaar ago | 0

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...

meer dan 9 jaar ago | 0

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 ...

meer dan 9 jaar ago | 0

| accepted

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

meer dan 9 jaar ago | 0

| accepted

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...

meer dan 9 jaar ago | 0

| accepted

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)) ...

meer dan 9 jaar ago | 0

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

meer dan 9 jaar ago | 0

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...

meer dan 9 jaar ago | 0

| accepted

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

meer dan 9 jaar ago | 1

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

meer dan 9 jaar ago | 0

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 ...

meer dan 9 jaar ago | 0

| accepted

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

meer dan 9 jaar ago | 1

| accepted

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...

meer dan 9 jaar ago | 0

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 ...

meer dan 9 jaar ago | 1

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...

meer dan 9 jaar ago | 1

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...

meer dan 9 jaar ago | 0

| accepted

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)

meer dan 9 jaar ago | 0