# VBBV

### PEC

Programming in MATLAB applied to interdisciplinary engineering fields

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**Content Feed**

How to count number of terms in a symbolic expression?

syms x y z='x*y+cos(x*y)*x+x*sin(x)+sin(x)*cos(x)-x-y+2' C = strsplit(z,{'+','-'}) length(C) C{3} % 3rd term

4 hours ago | 0

What command do i need after de hold off fuction to print the labels in my plot?

print('-image','-dpng', 'windclimate_allyears.png') Try using the OpenGL graphics rendering format as above. The version of Mat...

15 hours ago | 0

How do I optimize graph size?

May be the change in coefficient for cosine function plotted in black color as shown below z = -72:0.2:72; hold on Tb = 543.4...

13 days ago | 1

| accepted

I am trying to plot a series, with multiple variables.

clc; % Define parameters T_sub_1 = 100; H = 2; L=1; syms n % Create meshgrid x=linspace(0,2,20); y=linspace(0,4,20);...

13 days ago | 0

Matlab symbolic : calculate expression with vector of symbolic variables

Use the element wise operator for / and ^ ... i.e. ./ and .^ as below clear syms l_min l_max fsky Np var1D var2D varO1...

14 days ago | 0

while loop running forever during attempt at Newton Rhapson method

d=0.007; dI=1.219; Rfi=1.76*(10^(-4)); Rf0=Rfi; hs=356; ht=hs; kw=60; dTm=29.6; Q=801368; Aex=64.15; a=((1/ht)+Rfi)/dI...

15 days ago | 0

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Need to solve Fourier Series script

if you have the entire code in one script file, then you can put all the functions after the plot function call as below otherwi...

15 days ago | 0

Correlation Coefficient in Legend

Use the sprintf command in legend function just like the text, and include a higher precision specifier for decimals e.g,. 5...

25 days ago | 0

can't plot

syms p1 ap2 ap3 ap4 th1 = 0; ap1 = 0; a1 = 0; b1 = 0.5; c1 = 0; R1z = [ cos(p1), -sin(p1),0, 0; sin(p1), cos(p1), 0, ...

25 days ago | 0

why is this code not running?

plot(TimeValue, Pdispatch(:, 1), 'Color','r', 'LineWidth', 2);

4 months ago | 0

Error: variable might be used before it is defined.

Change this line yy2 = Pr*(y(4)*y(2)-y(1)*y(5)-Df*yy3-Nb*y(5)*y(7)-Nt*y(5)^2) to yy2 = Pr*(y(4)*y(2)-y(1)*y(5)-Df*y(3)-Nb*y...

4 months ago | 0

Why am I getting the error "Array indices must be positive integers or logical values" in MATPOWER?

The problem is with nested matrices bs or n2i matrices. % brs = ( mpc.branch(:, BR_STATUS) & ... %% branch status % ...

4 months ago | 0

Conversion of symbolic expression to double without obtaining complex numbers

oneway, is to use a conditional statement for negative input values through abs function. But if you want to avoid complex va...

4 months ago | 0

argument suggestion with shared argument validator

function s = fun3(a) arguments a {mustBeMember(a,@dummyClass)} = "a" end ...

4 months ago | 0

Matlab App designer export figure

% File exchange exportfig(app.UIAxes,"test") % Standard matlab function savefig(app.UIAxes,"test.fig") % exportgraphics ...

4 months ago | 0

f(x)=3x^3-5x^2+3x-7=0

x(1) = 0; % assuming x(1) = 0 kk(1)=1; for k=1:100; fx=3*x(k)^3-5*x(k)^2+3*x(k)-7; % use multplication operator for pro...

4 months ago | 0

How can I fix this error?

shipweightpmf( [2 2.5 6] )' function y = shipweightpmf(x) s = (1:8)'; p = [0.15*ones(4,1); 0.1*ones(4,1)]; y = finitepmf(s,...

4 months ago | 1

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How to disable a block in library ?

You can either use *switch-case* statements for controlling the execution of service meter blocks or a *function call* to trigge...

4 months ago | 0

Add values from vector to plot title

title({['Unit Step Response of G(s) = \omega_{n}/(s^2 + 2\zeta\omega_{n}s + \omega_{n}^2)'], ... ['\zeta = ', num2str(...

4 months ago | 0

how to create stack with multiple images?

b=cell(7,9); I_max=cell(7,9); I_stack_store=cell(9,1); for t=1:9 for i=1:7 I= rand(50,10,3); b{...

4 months ago | 0

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How to plot simulation results in a GUI while the simulation is running?

Use drawnow command for updating the simulation results Read more about the command here https://in.mathworks.com/help/matl...

4 months ago | 0

save images in array in two for loops

b=cell(7,9); for t=1:9 for i=1:7 I= rand(34,78,2); % image data b{i,t}=I; end end b = b(:)

4 months ago | 0

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Getting the Wrong Output While Using Image Batch Processor

possibly you are calliing the function porosity_function inside a loop, which repeats 12 times and storing the output for all im...

4 months ago | 0

a function just valid over a certain range

x = 0:0.1:10 ; for k = 1:length(x) if x(k) >= 2 & x(k)<= 8 y(k) = x(k).^2+3.*x(k)+1 ; else y(k...

4 months ago | 0

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error in multiplying symbolic variable in a matrix

clear clc syms z L [1 11] z , L x=[0 300 1000 1500 1700 2000 3000 3300 4000 4500 5000]; y=[32.0 122.4 296.4 405.7 447.6 60...

4 months ago | 0

How to write the output of matlab iteration results of many equations in excel in row by row specifying the starting row?

k = 1; for Xref1=0:0.1:1 % Loop through the range of inputs Xref1; Hi=Xref1*10; Lo=Xref1*5; out_put(k,:...

4 months ago | 0

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Stateflow onramp unreachable state task 4 error

Did you give the conditions & condition actions also from previous tasks ? It looks like you've added only transition

4 months ago | 0

simple function plot in MATLAB

Hi @Sanjida Use element wise division for evaluatiing the vector Y, It seems you have used incorrect operator ' \ ' this is...

4 months ago | 0

Properties of exponentials - symbolic algebra

Hi @Luca Lazzizzera You can of course use simplify as @Mischa Kim mentioned. However, if you want to obtain the simplified ex...

4 months ago | 0