Answered

linear system of equations

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

linear system of equations

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

5 years ago | 1

| accepted

Answered

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...

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...

5 years ago | 0

| accepted

Answered

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 ...

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 ...

5 years ago | 1

Answered

how to create customized curve ( only know the shape )

maybe this or similar would help <http://www.mathworks.com/matlabcentral/fileexchange/7173-grabit>

how to create customized curve ( only know the shape )

maybe this or similar would help <http://www.mathworks.com/matlabcentral/fileexchange/7173-grabit>

6 years ago | 0

Answered

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,...

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,...

6 years ago | 0

Answered

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...

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...

6 years ago | 1

| accepted

Answered

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 ./ ...

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 ./ ...

6 years ago | 0

Answered

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(...

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(...

6 years ago | 0

Answered

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 ...

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 ...

6 years ago | 0

Answered

Finding coefficients and constant for multivariable linear equation.

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

Finding coefficients and constant for multivariable linear equation.

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

6 years ago | 0

Answered

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...

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...

6 years ago | 0

Answered

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)

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)

6 years ago | 0

Answered

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 ...

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 ...

6 years ago | 0

| accepted

Answered

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...

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...

6 years ago | 0

| accepted

Answered

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...

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...

6 years ago | 0

| accepted

Answered

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)) ...

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)) ...

6 years ago | 0

Answered

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

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

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

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

6 years ago | 0

Answered

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...

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...

6 years ago | 0

| accepted

Answered

Cleaning-up Code With Comments

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

Cleaning-up Code With Comments

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

6 years ago | 0

Answered

Curve fitting to get gamma curve parameter

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

Curve fitting to get gamma curve parameter

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

6 years ago | 0

Answered

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 ...

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 ...

6 years ago | 0

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Answered

Plot empties after using datetick

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

Plot empties after using datetick

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

6 years ago | 1

| accepted

Answered

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...

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...

6 years ago | 0

Answered

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 ...

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 ...

6 years ago | 1

Answered

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...

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...

6 years ago | 1

Answered

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...

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...

6 years ago | 0

| accepted

Answered

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)

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)

6 years ago | 0

Answered

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?

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?

6 years ago | 0

Answered

How to obtain values symbolically

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

How to obtain values symbolically

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

6 years ago | 0