Community Profile # HWIK

Last seen: Today Active since 2020

Chemical engineering student

Programming Languages:
C++

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Error: "The application encountered an unexpected error and needs to close. You may want to try re-installing your product(s). More information can be found at:""
Hi, I'm trying to uninstall a bunch of toolboxes to free up some space on my computer, and when I go to the uninstaller program ...

6 months ago | 1 answer | 0

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draw two curves in matlab
Try this: x=[0:25:200]; y1= [0.4 0.29 0.21 0.19 0.13 0.11 0.09 0.05 0.006]; y2= [0.45 0.27 0.231 0.202 0.12 0.13 0.11 0.062 0...

11 months ago | 0

merge two datetime arrays into one datetime arrays
There might be something more efficient but this should work: dt = datetime(strcat(string(date')," ",string(time')))

11 months ago | 0

Plot an ODE solution with different constant values.
Is this what you are looking for? clear syms y(x) ode = diff(y,x) == (1.5 - 0.8*y) / (0.5 + 0.8*x); sol = dsolve(ode); y1 =...

11 months ago | 0

| accepted

Question

Optimization problem giving inconsistent answers upon changing initial guesses
Hi, I want to solve the following optimization problem from Optimization of Chemical processes: Here is what I have done so...

11 months ago | 1 answer | 0

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Question

Why can't Matlab do the factorial of a non-integer number?
Hi, I tried using the factorial function on a number with decimals and got the following error: N must be an array of real non...

12 months ago | 3 answers | 0

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The graph for the ODE45 function does not work
I think the script where you use ode45 is correct, because I don't see any errors there, and using a different method I get the ...

1 year ago | 0

| accepted

Scale on x-axis
Try this: set(gca, 'XTick', 0:0.2:0.8)

1 year ago | 0

Help with odes and two different reactions
Just write a function for the ODEs and feed it to the solver: function out = name_your_function(tspan, inputs) %Get your input...

1 year ago | 0

sym: how to subs two variables
From what you pasted I think you have a symbolic expression not function. I'm guessing you have some values of par1 and par2 a...

1 year ago | 0

differential equations system to be solved on matlab code
This code should work, but you must specify your initial conditions. You might want to look into other ode solvers, as with thes...

1 year ago | 0

MATLAB script to find the angle (in degrees) between two vectorsScrip
This has already been answered here: CosTheta = max(min(dot(u,v)/(norm(u)*norm(v)),1),-1); ThetaInDegrees = real(acosd(CosThet...

1 year ago | 0

| accepted

How can I ask Matlab to adjust a parameter in an equation until the answer becomes equal with a predetermined input value?
I'm not sure I quite understand the description but here is my go at it: function Actual_area = call_it_what_you_want(V,ht,Area...

1 year ago | 0

Solving ODE in MATLAB with pre-defined steps
I'm affraid that is not an option, this question was answered pretty clearly in this post. If you want specific points I sugges...

1 year ago | 0

select the correct row in a table with a different index in the for loop
Is this what you are looking for? for i=1:5:1440 j = i==1:5:1440; end Where j would be your new index in sequential orde...

1 year ago | 1

| accepted

How to simultaneously use logical indexing and date time indexing in a timetable?
Not to delete this question, I will answer it with what I found to be the closest to what I wanted through some documentation. ...

1 year ago | 0

| accepted

Question

How to simultaneously use logical indexing and date time indexing in a timetable?
Hi, Let's say I have a timetable with one of the variables being logical indexes, and I want to extract data from this timetabl...

1 year ago | 1 answer | 0

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Question

Bar plot with two axis no plotting as grouped
Hi, I want to plot a bar plot with two axis, and I want the two y vars to be grouped, but they always come out as stacked. I a...

1 year ago | 1 answer | 0

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Question

How to reference previous value in an array without a for loop?
Hi, I have a for loop set up following a similar structure to this: for i=2:size(data,1) data.Var3(i)=interp1(ref_dat...

1 year ago | 1 answer | 0

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Question

How to apply a set of operations to each field in a structured array?
Hi, Lets say I have a structured array with multiple fields in it. Each of those can have more fields or a timetable. I attache...

1 year ago | 0 answers | 0

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Question

How to vertically join differently sized tables?
Hi, Lets say I have two tables: table1=table(1,70,175,29,datetime(1992,7,1),"M",'VariableNames',{'Num','Weight','Height','Age'...

1 year ago | 1 answer | 0

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Question

How to avoid scientific notation in tables?
Hi, I have a table which I want to display (I am displaying it in and app from the Appdesigner), but when I do so I get in some ...

1 year ago | 1 answer | 0

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How to stackplot a table?
Finally figured it out, just reorder the data, I did it like this: load('example.mat') example=table; clear table tstamp=ver...

1 year ago | 0

| accepted

Question

How to stackplot a table?
Hi, I have a table of which I would like to make a stackedplot with each of its variables. I want to set the x axis as a datetim...

1 year ago | 3 answers | 0

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Question

How to make a table with date times and durations?
Hi, I have a set of datetimes and durations, and I want to merge them and display them in a table. I just can't figure out how t...

1 year ago | 2 answers | 0

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Question

How to remove autogenerated legend in stackedplot?
Hi, have the following stackedplot, and if I plot multiple variables in one of the stackedplots I get a legend that looks like t...

1 year ago | 1 answer | 0

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Question

Is it possible to stack axes of different plots in the same figure?
Hi, I am trying to plot some data in Matlab, where the various y axes appear to be sort of stacked on top of eachother, each hav...

1 year ago | 1 answer | 0

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Question

How to store words from a string in a cell array as a multiple strings
Hi, I have a 1x1 cell array containing a string of words: {'Date,Hour,Latitude,Longitude,Windspeed,Pressure'} How would you ...

1 year ago | 1 answer | 0

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Question

Translation of a plot line
Considering an existing figure, would it be possible to vertically translate one of the lines of the plot by a certain amount?

2 years ago | 1 answer | 0