# Robert Demyanovich

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**Content Feed**

Retrieve curve fit coefficients

I tried using coeffvalues, but all it does is store a bunch of text including the values that I want in a 1x1 something or other...

4 giorni ago | 0

Question

Retrieve curve fit coefficients

I am using a 4PL function written by someone and available from a MatLab search. I don't understand how to store the curve fitt...

4 giorni ago | 2 answers | 0

### 2

answersQuestion

stop execution of code to check results

Is there a way to stop code from executing so that results can be checked. For example something like if i == 100000 Stop...

7 giorni ago | 3 answers | 0

### 3

answersQuestion

Set upper and lower bounds of for loop

I would like to set the upper and lower bounds of a for loop based on the values of simulation parameters. I'm not sure how to...

27 giorni ago | 1 answer | 0

### 1

answerQuestion

How to handle NAN when summing

I have the following code: for k = 1:N W(i,k)=W1*(cB(i,k))^W2; Fluor(i,k)= cB(i,k)*W(i,k)*dx; end FL = su...

circa un mese ago | 1 answer | 0

### 1

answerQuestion

How to sum a portion of a row in a table and get a single value

How do I sum a portion of a row in a Matlab table and get a single value? For example assume that the row number is i and the c...

circa un mese ago | 1 answer | 0

### 1

answerQuestion

if statement with greater than and less than

The following doesn't seem to be working as intended: if 0 <= MBPosition <= 2*Delta ; Even though MBPosition is within the ran...

3 mesi ago | 2 answers | 0

### 2

answersQuestion

if statement for two arrays

I am programming a chemical reaction. I want to make sure that the amount of product produced does not exceed the amount of ava...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

Run "if" logic on a row

I have the following code for the reaction interface between acid and base (A-acid, B-base,S-salt): dS=k1*cA(i+1,:).*cB(i+1...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

Matlab less than comparison

The Matlab documentation is confusing me. I want to test each cell in a specific row of an array (cA). If that cell has a valu...

3 mesi ago | 2 answers | 0

### 2

answersQuestion

Include value requirement in array multiplication

I currently have the following line of code: dS=k1*cA(i+1,:).*cB(i+1,:)*dt dS is the amount of product S resulting from a reac...

3 mesi ago | 2 answers | 0

### 2

answersQuestion

if statement with ge and &

I don't understand why the following line is producing an error: if j ge 2 & cANALY(i+1,j-1) < 0 j is a scalar and cANALY(...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

"Highlight" a vertical gridline on a figure

I have a figure where the range of x values starts at a negative value and goes to a positive value. I would like to "highlight...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

set xticks by calculation but also force 0 to be displayed

I am setting xticks manually based on user inputs for distance. The plot will span the distance range; for example -1.3E-06 to ...

3 mesi ago | 2 answers | 0

### 2

answersQuestion

string for figure title ignores text after variable

I have the following code while creating a figure: titlestr=sprintf('Time=%6.5f',t(1), 'sec'); title(titlestr); No error...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

min function on two arrays

I've read the documentation on the min function, but still don't understand how it works on two arrays. I have the following: ...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

Sum function on part of an array

I don't understand what the following sum function does. mA=zeros(M,1); mA(1)=sum(cA(1,:))*dx; mA is a column vector, s...

3 mesi ago | 1 answer | 0

### 1

answerQuestion

Initializing 1/2 of a row with one value and the other half with another

I don't understand why the following works. It initializes row 1 of the array c with values of 1 in roughly the first half of t...

3 mesi ago | 2 answers | 0

### 2

answersQuestion

Find the first element of a column in a matrix that has a value equal to zero

I have an m by n matrix and I'm interested in the nth column. Initially all of the values in the nth column are greater than ze...

4 mesi ago | 1 answer | 0

### 1

answerQuestion

How to code an instantaneous reaction in Matlab

I have two slabs adjacent to one another. One contains acid and one contains base. The reaction at the interface in instantane...

4 mesi ago | 2 answers | 0

### 2

answersQuestion

Can Matlab be used to solve a moving boundary problem

I'm trying to determine the neutralization time (tn) of strong acid and strong base. Strong acid, A, is initially in a slab of t...

4 mesi ago | 0 answers | 0