defined n with the equation

• Create new arrays ‘delt’ and ‘delT’ as the mid-step values computed

from ‘t’ as delt = (t(n)-t(n-1)) and delT = (T(n)-T(n-1)). As a check, delt

will have positive values and delT will be negative values. With

negative delT values, the negative sign in the qm term will be flipped to

a positive one, resulting in positive values for h. ‘n’ is a subscript that

you could use to keep track entries of the time and temperature

arrays.

This what he wrote to us. I think that n = how many row that I have, but how I will write the equation t(n)-t(n-1) because I think he meant that t in row 5 mins t in row 5-1 but I could not figure this out. please help me.

[KALYAN ACHARJYA]

Can you share what you have tried so far?

[Abdulrahman Al Baalharith]

>> p = 8470; % defined the Density

>> d = 0.015; % defined the Diameter

>> l = 0.045; % defined the Length

>> cp = 4184; % defined the Specific heat capacity

>> Ts= 21; % defined the Temperature of the Canola oil in the quench tank

>> r = d/2; % defined the radius

>> V = (pi*(r^2)*l)); % Assume that the shape of the probe is Cylindrical and find the volume for it

V = (pi*(r^2)*l)); % Assume that the shape of the probe is Cylindrical and find the volume for it

↑

Error: Invalid expression. When calling a function or indexing a

variable, use parentheses. Otherwise, check for mismatched

delimiters.

>> V = (pi*(r^2)*l); % Assume that the shape of the probe is Cylindrical and find the volume for it

>> A = (2*pi*r*l+2*pi*(r^2)); % Find the area for the Cylindrical shape for the probe.

>> P4 = xlsread ('RDData'); % Reading the file

>> t = P4(:, 1); % Assign the first column to ‘t’,

>> T = P4(:, 2); % Assign the first column to ‘T’

>> n = (1:343); % ‘n’ is a subscript that you could use to keep track entries, and there is 343

>> delt = (t(n)-t(n-1)); % new arrays ‘delt’ as the mid-step values computed from ‘t’ as delt

Array indices must be positive integers or logical values.

>> n= size(1,P4)

Error using size

Dimension argument must be a positive integer scalar or a vector of

positive integers.

>> n= size(P4)

n =

563 5

>> delt = (t(n)-t(n-1));

Answer 1

[Fabio Freschi]

n= size(P4,1)

Answer 2

[Walter Roberson]

"Create as the midstep values are computed" is talking about a for loop with controlling variable n, and for n=2 onwards you calculate those expressions.

As they talk about creating those as arrays there is probably an implied

delt(n-1) = t(n) - t(n-1)