Question

The current and voltage data are recorded below every 5 seconds for 1 minute (called a minute test): time = 5:5:60; current = (16 25 32 40 45 47 44 40 33 26 20 11]; voltage = [2 5 4.5 4.7 5.5 5.4 4.2 3.9 3.3 3 2.8 2.1); a) Write a script that uses cubic equation to model both the current and voltage data as a function of time. The script will plot both sets of data points and the predicted models on the same graph with labelled axes and a legend. Use "red circle" to represent the current data points and "blue cross" to represent the voltage data points. Any built-in functions, loops and conditional statements can be used. [6] * + XO. Use the following MATLAB syntax to assist you in obtaining your plots: blue point solid green circle dotted red x-mark dashdot cyan plus dashed magenta star none) no line yellow square black diamond white triangle (down) triangle (up) triangle (left) triangle (right) pentagram hexagram OVA > b) A student would like to determine when the current would reach its maximum value during the minute test (i.e. within the 60 seconds) according to the fitting curve. Your task is to write a script that helps the student to determine the exact time within that minute when the current reaches its maximum value. [6]

Answer 1

`Hey,

Note: If you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

clc
clear all
close all
format long
time=5:5:60;
current=[16,25,32,40,45,47,44,40,33,26,20,11];
voltage=[2,5,4.5,4.7,5.5,5.4,4.2,3.9,3.3,3,2.8,2.1];
C1=polyfit(time,current,2);
C2=polyfit(time,voltage,2);
t=5:0.01:60;
y1=polyval(C1,t);
y2=polyval(C2,t);
plot(time,current,'or',t,y1,time,voltage,'xb',t,y2);
legend('current model','data current','voltage model','data voltage');
disp('Voltage reached maximum at');
f=@(x) -polyval(C2,x);
t=fminbnd(f,5,60)

- 5 x Pradeep - 0 X 56 Search Documentation Insert Tools EDITOR A Figure 1 Insert fx Eile Edit Comment % 99 o Indent 2 - EDIT View k Desktop Window . Help O E O current model data current voltage model data voltage Kax egg2.m x testc. mxahk. mx nse_filt. mx + A MATLAB R2018 HOME PLOTS APPS D E L Find Files 3 Compare - - Go To - New Save Open Print Find FILE NAVIGATE hal Windows System32 Current Folder Name 0409 1029 1033 1036 1040 1045 1046 1049 1055 3082 Advancedinstallers af-ZA am-et AppLocker appraiser Details e'); 0 10 20 30 40 50 60 Workspace Name c1 C2 H current Command Window Voltage reached maximum at Value [-0.0422,2.6058,4.0227] [-0.0032,0.1761,2.4273] 1x12 double @(x)-polyval(C2x) 27.8348 1x12 double 1x12 double 1x5501 double 1x5501 double 27.834807327858485 time Hvoltage Шу1 fx >>> y2 script . Ln 14 Col 71 ENG 4:54 AM IN 04/25/20 Type here to search "

Kindly revert for any queries

Thanks.