# Robert Demyanovich

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Question

Initializing all rows with one set of values in one half and another set in the other half

The following line of code works for initializing the first row of an array: cA(1,:)=[cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)...

5 days ago | 2 answers | 0

### 2

answersRetrieve 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...

10 days 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...

10 days 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...

14 days 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...

1 month 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...

1 month 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...

1 month 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 months 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 months 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 months 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 months 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 months 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 months 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...

4 months 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 ...

4 months 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...

4 months 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: ...

4 months 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...

4 months 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...

4 months 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 months 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 months 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 months ago | 0 answers | 0