Error using ==& mpower Matrix must be square.
Subject: Error using ==& mpower Matrix must be square.
Date: 8 Feb, :02
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(简体中文)matlab程序运行总是出现? Error using ==> sym.mpower Matrix must be square. 加了“.”还是不行呀m=zeros(1,50);a=zeros(1,50);b=zeros(1,50);f0=zeros(1,50);
syms d x1 x2
m(1)=1;c=10;a(1)=0;b(1)=0;
f=16*x1+60*x2+e.*((2.667*x1.^2+30*x1.*x2-).^2+(1.333*x1.^3+15*x1.^2.*x2-).^2); f0(1)=000000;
fx1=diff(f,'x1');
fx2=diff(f,'x2');for k=1:100
x1=a(k);x2=b(k);e=m(k);for n=1:100
f1=subs(fx1);
f2=subs(fx2);
if(double(sqrt(f1^2+f2^2))
dd=solve(Dd); x1=x1-dd.*f1; x2=x2-dd.*f2;dd不止一个根,所以新生成的x1,x2就不是两个数字了,而是两个矩阵,之后：f1=subs(fx1);f2=subs(fx2);f1,f2也变成矩阵,所以说if(double(sqrt(f1^2+f2^2))
f(double(sqrt(f1^2+f2^2)) sym.mtimes
Inner matrix dimensions must agree.
15*(x1-d.*f1).^2后边少了个点
顺便说一下，你这样算D就是好几个方程了
Dd=diff(D,'d');这一步就会出现多个方程1个未知数的情形，然后每个方程又不止一个根，这样没完没了了
你还是想办法在循环中想办法把根过滤下，只保留一个根
就是想办法让每次循环得到的dd只有1个值
为您推荐：
其他类似问题
扫描下载二维码ok, so i'm kind of a noob with
GUI, so there might just be something i'm missing
but i'm getting the above error when i run (with the press of a push button) :
c = ((weight^0.425) * (height^0.725)) * 0.007184
(where weight and height are just a number variable) i.e. 72;180
I'll get another error message saying that my inner matrix dimensions must agree
(i really don't get this as my so called &inner matrices& are just 1x1 constants... how can this not agree)
however, if i just run my code in a m-file, it all seems to work perfectly.
only when i run it using gui the problem persists
if anyone could help, it will be greatly appreciated
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&Kev & &kevin.& wrote in message &i73oe7$c59$1@&...
& ok, so i'm kind of a noob with
GUI, so there might just be something i'm missing
& but i'm getting the above error when i run (with the press of a push button) :
& c = ((weight^0.425) * (height^0.725)) * 0.007184
& (where weight and height are just a number variable) i.e. 72;180
I'll get another error message saying that my inner matrix dimensions must agree
& (i really don't get this as my so called &inner matrices& are just 1x1 constants... how can this not agree)
& however, if i just run my code in a m-file, it all seems to work perfectly.
& only when i run it using gui the problem persists
& if anyone could help, it will be greatly appreciated
anyone with any hints or suggestions??
It works fine for us:
weight = 72;
height = 180 ;
c = ((weight^0.425) * (height^0.725)) * 0.007184
MATLAB reports:
No error whatsoever.
Maybe you didn't transcribe it exactly.
My guess is that your weight and height AREN'T simple single scalar
numbers because MATLAB says they are matrices.
Set a breakpoint to
ImageAnalyst
ImageAnalyst && wrote in message &9dce6c2b-e0d6-4a0b-9a5e-c360cbebe32d@&...
& It works fine for us:
& weight = 72;
& height = 180 ;
& c = ((weight^0.425) * (height^0.725)) * 0.007184
& MATLAB reports:
& No error whatsoever.
Maybe you didn't transcribe it exactly.
& My guess is that your weight and height AREN'T simple single scalar
& numbers because MATLAB says they are matrices.
Set a breakpoint to
That's the thing though, if i run it in m-file
it will work fine
running it in gui however, will return errors
(where weight and height are variable inputs)
another funny thing is that, if my height and weight variables are both 0, it will not return errors
so imagine a gui with 2 edit text boxes, a push button and
a static text field
with this as my code for the push button:
% --- Executes on button press in pushbutton_update.
function pushbutton_update_Callback(hObject, eventdata, handles)
handle to pushbutton_update (see GCBO)
% eventdata
reserved - to be defined in a future version of MATLAB
structure with handles and user data (see GUIDATA)
height = get(handles.edit_heigh,'String');
%get variable from height
weight =get(handles.edit_weigh,'String');
%get variable from weight
b = weight.^0.425 * height.^0.725 * 0.007184;
%what i want to calculate
set(handles.show_stat,'string', b)
%show b in static text field
guidata(hObject,handles);
On 19/09/10 10:14 PM, Kev wrote:
& height = get(handles.edit_heigh,'String'); %get variable from height
& weight =get(handles.edit_weigh,'String'); %get variable from weight
& b = weight.^0.425 * height.^0.725 * 0.007184; %what i want to calculate
You realize that when you get() the String property of an edit box, you
get back a string? A character array that is? You have to convert the
character array to a number to make use of it in your formula. There are
a number of different ways of doing that -- sscanf(), textscan(),
str2double(), str2num(), eval() ...
Walter Roberson && wrote in message &kdBlo.63946$rC7.44537@newsfe10.iad&...
& On 19/09/10 10:14 PM, Kev wrote:
& & height = get(handles.edit_heigh,'String'); %get variable from height
& & weight =get(handles.edit_weigh,'String'); %get variable from weight
& & b = weight.^0.425 * height.^0.725 * 0.007184; %what i want to calculate
& You realize that when you get() the String property of an edit box, you
& get back a string? A character array that is? You have to convert the
& character array to a number to make use of it in your formula. There are
& a number of different ways of doing that -- sscanf(), textscan(),
& str2double(), str2num(), eval() ...
oh! I didn't think of that, gave that a quick tried just now and it works
Thank you so much.
mpower Matrix must be square." />
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