Answered

matrix look up issue

Time to learn about matrix indexing? [row] = find(T_T==RPM_val) First of all, this searches the ENTIRE matrix for a valu...

matrix look up issue

Time to learn about matrix indexing? [row] = find(T_T==RPM_val) First of all, this searches the ENTIRE matrix for a valu...

11 days ago | 0

| accepted

Answered

Simulink code seems not to use pc's proccessing power.

That seems to indicate you are only using one core. First, I might check maxNumCompThreads Then you might take a read...

Simulink code seems not to use pc's proccessing power.

That seems to indicate you are only using one core. First, I might check maxNumCompThreads Then you might take a read...

11 days ago | 0

Answered

How to solve an equation with a variable that has multiple values.

No need to do anything special like having a different variable for each case! Use a vector. x = [0, 15, 30, 55, 85]; y ...

How to solve an equation with a variable that has multiple values.

No need to do anything special like having a different variable for each case! Use a vector. x = [0, 15, 30, 55, 85]; y ...

12 days ago | 0

Answered

In my a for loop where I eg need to go from 1 to 11, and want to make my step size 4 what happens when the computer have to make the last step and it goes over 11?

Why not try it? You can see the behavior from one line of code. 1:4:11 ans = 1 5 9 So if the incremen...

In my a for loop where I eg need to go from 1 to 11, and want to make my step size 4 what happens when the computer have to make the last step and it goes over 11?

Why not try it? You can see the behavior from one line of code. 1:4:11 ans = 1 5 9 So if the incremen...

12 days ago | 0

Answered

How can I assign different colors to two-line plot title?

I don't think you can do so, at least not while using title. Title is not designed to set distinct colors for each line. Instead...

How can I assign different colors to two-line plot title?

I don't think you can do so, at least not while using title. Title is not designed to set distinct colors for each line. Instead...

13 days ago | 0

| accepted

Answered

I would like to evaluate a partial sum for N=3,N=10,N=25 and at the same (or any N). How can this be done?

Oh, you made a serious effort. Lots of ways to do it of course. (BTW, NEVER use sum as a variable name!!!!!) Simplest is: ...

I would like to evaluate a partial sum for N=3,N=10,N=25 and at the same (or any N). How can this be done?

Oh, you made a serious effort. Lots of ways to do it of course. (BTW, NEVER use sum as a variable name!!!!!) Simplest is: ...

13 days ago | 0

Answered

Is it possible to calculate a 10- Dimensional integral

Is it possible to compute the 10-d integral shown here, or something like that, but not shown, and far more complicated? Almost ...

Is it possible to calculate a 10- Dimensional integral

Is it possible to compute the 10-d integral shown here, or something like that, but not shown, and far more complicated? Almost ...

13 days ago | 1

| accepted

Answered

How to find the intersection points on two functions

Standard question: how to find the intersection(s) of two functions. 1. Subtract them. Where the difference is zero, there l...

How to find the intersection points on two functions

Standard question: how to find the intersection(s) of two functions. 1. Subtract them. Where the difference is zero, there l...

14 days ago | 0

Answered

Why do my questions get very few views ?

Beyond what Walter said, your question may have a very ambiguous title. Like "Please help me". Nobody knows whether to bother lo...

Why do my questions get very few views ?

Beyond what Walter said, your question may have a very ambiguous title. Like "Please help me". Nobody knows whether to bother lo...

14 days ago | 2

Answered

Matlab multiplication of two matrices in max-plus algebra?

You will need to write the code, overloading + and * (thus the functions plus and mtimes) for inputs of class double. Then you n...

Matlab multiplication of two matrices in max-plus algebra?

You will need to write the code, overloading + and * (thus the functions plus and mtimes) for inputs of class double. Then you n...

16 days ago | 0

Answered

"Struct contents reference from a non-struct array object." What does this mean?

When you try to run the above code, why not read the warning messages too? This is what dsolve returns: S= dsolve(eqn1, eqn...

"Struct contents reference from a non-struct array object." What does this mean?

When you try to run the above code, why not read the warning messages too? This is what dsolve returns: S= dsolve(eqn1, eqn...

16 days ago | 0

Answered

I'm a noob. Can anyone make this simpler or more efficient?

Um, yes, I could make it "simpler" and perhaps more efficient. Who cares? Don't pre-optimize code without some reason to do so. ...

I'm a noob. Can anyone make this simpler or more efficient?

Um, yes, I could make it "simpler" and perhaps more efficient. Who cares? Don't pre-optimize code without some reason to do so. ...

17 days ago | 1

Answered

unbalanced parenthesis on a problem

I would start by writing it using valid syntax for MATLAB. This is not that. 2cos(2pi((f(1)-f(2)/2)t)sin(2pi((f(1)+f(2)/2)t...

unbalanced parenthesis on a problem

I would start by writing it using valid syntax for MATLAB. This is not that. 2cos(2pi((f(1)-f(2)/2)t)sin(2pi((f(1)+f(2)/2)t...

17 days ago | 1

Answered

Please , how can I find the center and the radius of the inscribed circle of a set of points

If I were going to solve the problem of finding an incircle for a general non-degenerate closed polygon, I MIGHT try the followi...

Please , how can I find the center and the radius of the inscribed circle of a set of points

If I were going to solve the problem of finding an incircle for a general non-degenerate closed polygon, I MIGHT try the followi...

17 days ago | 0

Answered

Possibility of minus result in forecast?

Why not? Of course this is possible. Computers don't understand what you are doing. They have no concept of precipitation, or th...

Possibility of minus result in forecast?

Why not? Of course this is possible. Computers don't understand what you are doing. They have no concept of precipitation, or th...

18 days ago | 0

| accepted

Answered

Solving same symbolic equation but getting different results?

They are NOT the same equations!!!!!!!! There is a difference. In the first equation, MATLAB is told that dy is a constant. T...

Solving same symbolic equation but getting different results?

They are NOT the same equations!!!!!!!! There is a difference. In the first equation, MATLAB is told that dy is a constant. T...

19 days ago | 1

| accepted

Answered

i am trying to write a function.

Learn to use nargin, so you can test to see how many arguments were provided. Then you can put a branch in to do the calculation...

i am trying to write a function.

Learn to use nargin, so you can test to see how many arguments were provided. Then you can put a branch in to do the calculation...

19 days ago | 0

Answered

Converting a fraction into a floating number

No. There is no need to use float. x = 2/5 x = 0.4 whos x Name Size Bytes Clas...

Converting a fraction into a floating number

No. There is no need to use float. x = 2/5 x = 0.4 whos x Name Size Bytes Clas...

20 days ago | 0

Answered

PCA and data projection issue

Flipped signs is completely irrelevant. An eigenvector is not unique, since you can multiply it by any constant and still ha...

PCA and data projection issue

Flipped signs is completely irrelevant. An eigenvector is not unique, since you can multiply it by any constant and still ha...

20 days ago | 0

Answered

Same Functions but Return Different Values

When you create a function handle, any constants in there are encapsulated, frozen in place at the values they took on when the ...

Same Functions but Return Different Values

When you create a function handle, any constants in there are encapsulated, frozen in place at the values they took on when the ...

21 days ago | 1

Answered

Solving system of linear equations with boundaries, linsolve does not work

Linsolve DOES work, IF you use it properly. If not, well, garbage in, garbage out. Apparently you are telling us that {u1, f2...

Solving system of linear equations with boundaries, linsolve does not work

Linsolve DOES work, IF you use it properly. If not, well, garbage in, garbage out. Apparently you are telling us that {u1, f2...

21 days ago | 1

Answered

How do I plot a 3D surface bounded over the first octant?

It fails to do what you asked to do, because what you did has nothing to do with constraining it to the first octant. You genera...

How do I plot a 3D surface bounded over the first octant?

It fails to do what you asked to do, because what you did has nothing to do with constraining it to the first octant. You genera...

21 days ago | 0

| accepted

Answered

combine or merge the signals

By concatenating them into an array. help horzcat Learn how to use square brackets. But this is basic MATLAB. So really,...

combine or merge the signals

By concatenating them into an array. help horzcat Learn how to use square brackets. But this is basic MATLAB. So really,...

21 days ago | 0

Answered

How to solve system of 3rd order differential equations in Matlab

But nobody knows what you have tried. Just saying that you have tried lots of things helps nobody to help you, because that forc...

How to solve system of 3rd order differential equations in Matlab

But nobody knows what you have tried. Just saying that you have tried lots of things helps nobody to help you, because that forc...

21 days ago | 1

Answered

How to connect minimum points into a line?

n = length(x); M = [x,ones(n,1)]; C = lsqlin(M,y,M,y); C = -20.501 1191.8 plot(x,y,'b.',x,C...

How to connect minimum points into a line?

n = length(x); M = [x,ones(n,1)]; C = lsqlin(M,y,M,y); C = -20.501 1191.8 plot(x,y,'b.',x,C...

22 days ago | 2

| accepted

Answered

Different result on fmincon - same machine, Linux OS

There are many things in code that you THINK should be deterministic, but are in fact not. Many functions you might call can end...

Different result on fmincon - same machine, Linux OS

There are many things in code that you THINK should be deterministic, but are in fact not. Many functions you might call can end...

23 days ago | 0

Answered

Exp Fit Error: Error using fit>iFit (line 340) NaN computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients.

Here is your model: y = (1-a)*exp(-x*b)+a*exp(-x*(c+b)) If you require that c be a positive number, then if you write th...

Exp Fit Error: Error using fit>iFit (line 340) NaN computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients.

Here is your model: y = (1-a)*exp(-x*b)+a*exp(-x*(c+b)) If you require that c be a positive number, then if you write th...

23 days ago | 0

Answered

How to solve this optimization problem (with matlab optimization toolbox)?

No other answer yet? This is probably homework, or some sort of contest puzzle. The optimum does not exist under the existing...

How to solve this optimization problem (with matlab optimization toolbox)?

No other answer yet? This is probably homework, or some sort of contest puzzle. The optimum does not exist under the existing...

24 days ago | 0

Answered

Taylor Series for arctan

There are a few issues here that careful coding would clean up. For example, why do you need variables n AND counter, when both ...

Taylor Series for arctan

There are a few issues here that careful coding would clean up. For example, why do you need variables n AND counter, when both ...

25 days ago | 0

Answered

INTERP2 WITH LOOP FOR

Not sure why you are using a loop, when interp2 can interpolate the whole set in one call. But making your code reasonably effic...

INTERP2 WITH LOOP FOR

Not sure why you are using a loop, when interp2 can interpolate the whole set in one call. But making your code reasonably effic...

26 days ago | 0

| accepted