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linear system of equations

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

mer än 8 år 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...

nästan 9 år 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 ...

ungefär 9 år 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>

mer än 9 år 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,...

mer än 9 år 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...

mer än 9 år ago | 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 ./ ...

mer än 9 år 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(...

mer än 9 år 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 ...

mer än 9 år ago | 0

Finding coefficients and constant for multivariable linear equation.

You don't have enough points. 4 points < 5 unknowns

mer än 9 år 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...

mer än 9 år ago | 0

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)

mer än 9 år 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 ...

mer än 9 år ago | 0

| accepted

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...

mer än 9 år 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...

mer än 9 år ago | 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)) ...

mer än 9 år ago | 0

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

try ones(size(w))*w.'

mer än 9 år 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...

mer än 9 år ago | 0

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Cleaning-up Code With Comments

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

mer än 9 år ago | 1

Curve fitting to get gamma curve parameter

If you have the statistics toolbox, you can use: gamfit()

mer än 9 år 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 ...

mer än 9 år ago | 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...

mer än 9 år 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...

mer än 9 år 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 ...

mer än 9 år 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...

mer än 9 år 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...

mer än 9 år 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)

mer än 9 år ago | 0

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?

mer än 9 år ago | 0

How to obtain values symbolically

alternative: c =sym(1:10) f = @(x) sum(c.*x.^(1:length(c)));

nästan 10 år ago | 0