# Davide Masiello

### Paul Scherrer Institut (PSI)

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**Programming Languages:**

MATLAB

**Spoken Languages:**

English, Italian

**Professional Interests:**

Chemical Kinetics, Fluid Dynamics, Chemical Engineering, Heat and Mass Transfer

**Statistics**

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Question

Import data from *.ch file

Hello - has anyone ever tried to import gas chromatograph data from files with .ch extension?

4 months ago | 0 answers | 0

### 0

answersInsert zeros in random positions following another zero

This should work without the need for a for loop. X = [2 1 0 4 5 0 778 90 0 3 88 0 77 66 0 12 23 0 45 80 0 89 67 0 34 67 0 76 3...

9 months ago | 0

Modelling with 2 input variables and 1 output variable

Hello - I would recommend reading the documentation of the function fit.

9 months ago | 0

Array indices must be positive integers or logical values.

The problem is in the convergence check step, where you try to evaluate eta at n-1 even when n = 1. Adding n > 1 as additional ...

11 months ago | 0

Calculating the area of overlapping polgyons

How about this? % Clear the workspace and close all figures clear,clc % Define the vertices of the polygons polygon1 = [0,...

1 year ago | 0

How to morph a shape into another

I guess it boils down to what mapping you choose from the points of shape 1 to the points of shape 2. Let's take your case for ...

1 year ago | 1

| accepted

How do I shade the area between two curves on a plot that is generated by arrays?

Use the patch function. x1 = [1 2 3]; y1 = [2 5 8]; x2 = [1 2.5 3.5]; y2 = [1 6 3]; hold on patch([x1 flip(x2)], [y1 fli...

1 year ago | 1

| accepted

Combining legend data ?

Here's an example with made up functions (your code was too slow on the browser). Is this what you're looking for? y = linspa...

1 year ago | 0

Is it possible to programmatically suppress figure roll-over menu (zoom, rotate, etc)?

This should work, but it also suppresses the fixed toolbar above the figure f = figure; f.ToolBar = 'none';

1 year ago | 0

Solve for pressure swing adsorption cycle for two gases in one bed.

Hi @Samridh Sharma, please see the modifications I made to the code and the resulting output. Please let me know if you have fu...

1 year ago | 0

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Solving simultaneous set of differential equations for range of values to get desired set output

I'd recommend taking a look at the material at the following link https://ch.mathworks.com/help/matlab/math/boundary-value-prob...

1 year ago | 0

Draw 1 hyperboloid with equation -0.2x^2 - 0.2y^2 +z^2 =1 with colormap jet

[x,y] = meshgrid(linspace(-10,10,100)); z = sqrt(1+0.2*x.^2+0.2*y.^2); Then you can plot it in many ways. Examples figure...

1 year ago | 0

ODE simulation: issue with the size of arrays

In addition to my comment above, here's a solution to your problem. It's based on the fact that you can specify tspan as a vect...

1 year ago | 0

How to do custom equation (non linear) regression?

Assume these are your experimental data x = linspace(0,20,30); y = rand(size(x))/3+(pi*x.^(sqrt(2)/2))./(26.1-x); figure(1) ...

1 year ago | 0

help with curve fitting with a data function

Just needed better initial guesses, I think data = readmatrix('ottica10.txt'); M = 2; myfun = @(p,x) 1/M*exp(-p(1)*0.5*x).*ab...

1 year ago | 0

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Hello! How to define on which plane lies a given point with coordinates? I have coordinates of plane and normal

Four points can be verified to belong on the same plane if the determinant of the matrix is equal to zero. I'd translate tha...

1 year ago | 0

Interpolation of given data in 2d domain

Example xdata = linspace(1,10,10) ydata = linspace(0,1,11) zdata = rand(length(ydata),length(xdata)) x0 = [2.5 3.5 4.5 5.5];...

1 year ago | 0

How to include NaN elements in an array based on a condition?

a = [2 4 6 12 14 18]; A = a(1):2:a(end); new_a = zeros(size(A)); idx = any(a'== A,1); new_a(idx) = a; new_a(~idx) = nan; n...

1 year ago | 0

| accepted

Minimize the sum of squared errors between the experimental and predicted data in order to calculate two parameters

You can use MatLab's fmincon. z = [0.006;0.012;0.018;0.024;0.03;0.046;0.069;0.091;0.122;0.137;0.152;0.162]; u_exp = [0.709...

1 year ago | 0

| accepted

Why do I receive "Not enough input arguments"? or How can I better code this ODE?

Here's a correct version of your code. 1) Time span and initial conditions must be in the same file as the ode solver, not sure...

1 year ago | 1

I have solved a set of three coupled odes in MATLAB. I have to plot another function which is a function of one of these odes. How this can be done?

If none of the differential equations you are solving depends on deln, then you can compute it after solving the ODE system. To...

1 year ago | 1

| accepted

In this code, I want to find out slope at every value of x?

You could use the gradient function provided by MatLab. x=[10.33 10.331 10.332 10.333 10.334 10.335 10.336 10.337 10.338 10.339...

1 year ago | 0

How to plot scatter plot with conditions?

data = readmatrix('table.xlsx'); time = data(:,1); PW = data(:,2); You can identify all the indexes for which the differenc...

1 year ago | 0

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How do I exclude values in linspace?

Hi @lea.c, I have several comments about your code. 1) MatLab already implements a function called integral, so I would recomme...

1 year ago | 0

Loop over initial guesses with fsolve

Try with func=@f; x0=[1:0.1:1.9;1:0.1:1.9;1:0.1:1.9;1:0.1:1.9;0.01:0.01:0.1;0.01:0.01:0.1;0.01:0.01:0.1]; x = zeros(10,7); ...

1 year ago | 1

| accepted

Help with numerical integral

I guess this is what you're looking for e=0.1; f=@(x)exp(x)./(1+x); a=0.5; b=1.1; n=2; h=(b-a)/n; i=1:1:n-1; S=f(a...

1 year ago | 0

Legend with certain number of rows and columns

Use legendflex from file exchange. x = linspace(0,1,1000); n = (1:6)'; y = x.^n; p = plot(x,y); title('y = x^n') legendf...

1 year ago | 1

| accepted

Creating a row vector of combinations?

You could use nchoosek. The example below is from -3 to 3 for memory issues (you'll generate a humongous matrix). Just substitut...

1 year ago | 0

| accepted

How to remove the zeros from the array upon breaking out of the for loop?

Would this suit your purpose? RHo = 0.5; % Relative Humidity air [%] M= 0.018; % molar mass of water mol...

1 year ago | 0

How o define two different data set of (t , T) for an ode solver that it's variables are (t , C)?

I think your code is fine, below you can see a slightly different approach that uses interpolation to define the T(t) dependence...

1 year ago | 0

| accepted