Community Profile # Robert Demyanovich

Last seen: 4 dagar ago Active since 2021

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Output the amount of time it took to run a simulation
My simulations take a long time. I would like to be able to measure the amount of time it took for a simulation to run. I woul...

5 dagar ago | 2 answers | 1

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Question

Semilog plot that includes curve fit
I have used the curve fitting app to generate code to plot the data and the curve fit. I am new to MatLab but it looks like the ...

17 dagar ago | 1 answer | 0

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Semilog plot in curve fitting tool
I am new to using the curve fitting tool. I have some data that I want to fit a curve to. I have clicked on the curve fitting ...

17 dagar ago | 1 answer | 0

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Question

Ignore zero values when searching for minimum value in column of matrix
I have the following code to find the minimum value in the last column of matrix cANALY: [tnValueAnaly, tnRowAnaly] = min(cANAL...

18 dagar ago | 1 answer | 0

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Find the maximum value of a column in a table
I have a spreadsheet that is read into a Matlab table. I need to get the maximum value in column 1. I thought the following wo...

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Highest row number in a table
I am reading an excel spreadsheet into a table in MatLab. The number of rows and columns can vary. I need to find the maximum ...

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Scan a row and replace any values equal to zero
I need to replace any zero values in the columns of a specific row, i +1, of a matrix, cA, with a specific value, say 1E-07. How...

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Sum of Least Squares
I have a table, Check, where I would like to subtract column 6 from column 5 (to obtain a residual) and then square the residual...

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Dimensions of arrays being concatenated are not consistent.
I have no idea why I am getting an error in the following code: FluorDataInd = round(i/TimeFactor)+1 x=[ConcValues{1,1} Co...

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Select a record from a table where an exact value is not provided
I have a table which I will be loading with Excel data (I haven't ever done that, but I think I can just paste data in). My que...

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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)...

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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...

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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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(...

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"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...

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Question

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 ...

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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...

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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: ...

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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...

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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...