Question

我使用Matlab从Excel文件中读取。我应该读一个名为Change Due的整数列。在我读完专栏后，我应该在Quarters，Dimes..etc

中计算变化

我可以阅读专栏没问题，我理解如何计算变化的数学。然而使用条件来检查更改量很难......

问题：

我知道对于乘法/矢量分割，您可以添加一个句点，使其成为标量。* 或 ./

但是如何解析具有条件的向量？

if(Change.<25&&Change.>=10)

我收到此错误：

Operands to the || and && operators must be convertible to logical scalar values.

如果我只是简单地将句点留出来，我就不会收到错误消息，但它只会通过第一行进行计算。

代码：

% Filename: Program_04_1
% Author: Stewart Moon
% Assisted by: No one
% Program Description:
% The purpose of this program is to demonstrate how to read from an Excel
% file and to then calculate the amount of coins it will take per row

clc % clc clears the contents of the command window
clear   % clear, clears all defined variables form the Matlab workspace
close all % closes all figure windows

% Declare Variables
Quarters=0;
Dimes=0;
Nickels=0;
Pennies=0;
TotalCoins=0;

% Output of the title and author to the command window
fprintf('Output for Program_04_1 written by Stewart Moon.\n')
fprintf('\nOriginal Data read from Program_04_1_Data.xlsx\n')
fprintf('\nMinimum Number of Coins Needed to Make Change\n')

Change=xlsread('Tutorial_04_1_Data.xlsx','Coins','B4:B43'); % Reading the column in Excel and storing it the variable Change

% Output Header Format
fprintf('\nChangeDue(cents) Quarters Dimes Nickels Pennies Total Coins\n\n')

table=[Change];
disp([table])

命令窗口输出：

Output for Program_04_1 written by Stewart Moon.

Original Data read from Program_04_1_Data.xlsx

Minimum Number of Coins Needed to Make Change

ChangeDue(cents) Quarters Dimes Nickels Pennies Total Coins

 1
 4
 5
 6
10
14
15
16
20
24
25
29
30
31
35
37
40
42
45
49
50
54
55
56
60
64
65
68
70
73
75
77
80
81
85
88
90
91
95
99

计算更改伪代码：

while(Change>0)

    if (Change>=25)
       Change=Change-25;
       TotalCoins=TotalCoins+1;
       Quarters=Quarters+1;
        end
     if (Change<25&&Change>=10)
       Change=Change-10;
       TotalCoins=TotalCoins+1;
       Dimes=Dimes+1;
        end
     if (Change<10&&Change>=5)
       Change=Change-5;
       TotalCoins=TotalCoins+1;
       Nickels=Nickels+1;
        end
     if (Change<5&&Change>=1)
       Change=Change-1;
       TotalCoins=TotalCoins+1;
       Pennies=Pennies+1;
        end
end

Answer 1

根据我的理解，你想要达到如下目的：

for i = 1 : length(Change)
% your conditions using indices for the array
% example: 
% if(Change(i) > 25)
%   instructions
% end
end

从Excel文件中读取并操作数据

1 个答案: