如何在matlab中将一个字符串的值赋给另一个字符串

Question

我有一个简单的问题。我要计算训练心rate.And 我有一些值。 RHR 表示静息心率。 INTEN 表示健身水平，我为低、中和高健身水平给出值 0.55、0.65、0.8 我写了代码

 Gender=input('Please input your gender: ');
 Age=input('Please input your age: ');
 RHR=input('Please enter your resting heart rate: ');
 INTEN=input('Please enter your fitness level(low,medium or high): ');
 male=Male;
 female=Female;
 low=0.55;
 medium=0.65;
 high=0.8;
 if INTEN==0.55
 INTENT=0.55;
 elseif INTENT==medium
INTENT=0.65;
else 
INTENT=0.8;
end
 if Gender==Male
 THR=((220-Age)-RHR)*INTEN+RHR;
 elseif Gender==Female
 THR=((206-0.88*Age)-RHR)*INTEN+RHR;
 end
  disp('The recommended training heart rate is ',num2str(THR))

但是为什么报错？

Answer 1

您的代码中有几个错误。值得注意的是，您正在使用保留的操作来比较数字和字符串，这是不可能的。而且，变量 Gender 应该是一个字符串，却被当作一个数字来操作，这让人很困惑。请务必查看用于比较字符串的函数 strcmp。然后你可以使用 if/elseif 块。

我建议使用 prompt 来查询用户的信息。这样所有内容都会同时显示，在我看来使用起来更简单。

这是带注释的代码。如果有什么不清楚的地方请告诉我。

clc
clear

%// Set up dialog promt.
prompt = {'Enter your gender (male/female)','Enter your age:','Enter your resting heart rate: ','Enter your fitness level(low,medium or high): '};
dlg_title = 'Input';
num_lines = 1;

%// Default answers
def = {'male','30','120','medium'};

%// The answers are stored in the cell array called "answer". Its a 4x1
%// cell array containing ONLY STRINGS.
answer = inputdlg(prompt,dlg_title,num_lines,def);

%// Transform the strings into numbers that you can use.
Gender = answer{1};
Age = str2double(answer{2});
RHR = str2double(answer{3});
INTEN = answer{4};

%// A switch/case statement to convert INTEN into the number used for
%// the calculation
switch INTEN
    case 'low'
        INTEN=0.55;
    case 'medium'
         INTEN=0.65;
    case 'high'
        INTEN=0.8;
end

%// Use strcmp to compare strings. 
if strcmp(Gender,'Male') || strcmp(Gender,'male')

    THR=(220-Age-RHR)*INTEN+RHR;

elseif strcmp(Gender,'Female') || strcmp(Gender,'female')

    THR=((06-0.88*Age)-RHR)*INTEN+RHR;

end

%// Create a string to display
DispMessage = sprintf('The recommended training heart rate is %0.2f\n',THR);

%// Create a message box to display the above string.
msgbox(DispMessage)

这是提示 window 的样子：

并显示消息：

希望对您有所帮助！

Answer 2

Matlab 无法确定您输入的内容。正确的版本是：

 Gender=input('Please input your gender: ','s');

此外，您的代码中还有更多错误，我建议您自行修复。我的不太高级的版本然后 abowe：

Gender=input('Please input your gender: ','s');
Age=input('Please input your age: ');
RHR=input('Please enter your resting heart rate: ');
INTEN=input('Please enter your fitness level(low,medium or high): ','s');
if strcmp(INTEN,'low')
INTENT=0.55;
elseif strcmp(INTEN,'medium')
INTEN=0.65;
else 
INTEN=0.8;
end

if strcmp(Gender,'male')|| strcmp(Gender,'Male')
THR=((220-Age)-RHR)*INTEN+RHR;
if strcmp(Gender,'female')|| strcmp(Gender,'Female')
THR=((206-0.88*Age)-RHR)*INTEN+RHR;
end

printres=['The recommended training heart rate is ',num2str(THR)];
disp(printres)

如何在matlab中将一个字符串的值赋给另一个字符串

How to give value of string to another string in matlab

string

math

matlab

if-statement