弗拉基米尔·索夫科夫（Vladimir Sovkov）
St. Petersburg State University
专业利益：计算物理，应用数学
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内容提要
回答
How do I uninstall MATLAB on Windows when the uninstaller fails?
I have a similar but somewhat different problem. For a couple of years, I used Matlab 2019b with Windows 10. This year I decided...
How do I uninstall MATLAB on Windows when the uninstaller fails?
I have a similar but somewhat different problem. For a couple of years, I used Matlab 2019b with Windows 10. This year I decided...
9个月前|1
回答
如何适应无限级数的功能？
An iterative solution instead of the symbolic one can be more productive this case, like this one x=[0 5 10 15 20 30 45 60 75 9...
如何适应无限级数的功能？
An iterative solution instead of the symbolic one can be more productive this case, like this one x=[0 5 10 15 20 30 45 60 75 9...
1年前|0
|accepted
回答
When i try this sym('x')^y i get an error message
您无法直接计算此内容，因为整数比MATLAB能够处理的要大。您可以尝试b = sym（log10（18008 ...）
When i try this sym('x')^y i get an error message
您无法直接计算此内容，因为整数比MATLAB能够处理的要大。您可以尝试b = sym（log10（18008 ...）
1年前|1
回答
如何在MATLAB中绘制步骤功能
SYMS X;y =零件（x <0,0，0 <= x <2*pi，exp（-x）。*cos（x），x> = 2*pi，2*exp（-x）。*cos（x）;t = linspace（-pi，4*pi，1000）;情节（t，subs（y，x，...
如何在MATLAB中绘制步骤功能
SYMS X;y =零件（x <0,0，0 <= x <2*pi，exp（-x）。*cos（x），x> = 2*pi，2*exp（-x）。*cos（x）;t = linspace（-pi，4*pi，1000）;情节（t，subs（y，x，...
2年前|0
回答
Adding or subtracting the same number
n = 4;％阵列长度x =零（1，n）;％样品阵列d = 0.4;要添加/减去k = rand（1，n）的％值;％均匀的随机数...
Adding or subtracting the same number
n = 4;％阵列长度x =零（1，n）;％样品阵列d = 0.4;要添加/减去k = rand（1，n）的％值;％均匀的随机数...
2年前|1
回答
make different numbers with the same digits
x=1342; y=str2num(sort(num2str(x),'ascend')); % smaller z=str2num(sort(num2str(x),'descend')); % bigger
make different numbers with the same digits
x=1342; y=str2num(sort(num2str(x),'ascend')); % smaller z=str2num(sort(num2str(x),'descend')); % bigger
2年前|0
回答
是否可以编写一个代码来检查和分析向量中具有100个值的数据，因此请认识到，如果一个或两个与其他数据相比，一个或两个很高？
This is known as the problem of locating outliers. Various approaches were proposed. E.g., the one based on the median absolute ...
是否可以编写一个代码来检查和分析向量中具有100个值的数据，因此请认识到，如果一个或两个与其他数据相比，一个或两个很高？
This is known as the problem of locating outliers. Various approaches were proposed. E.g., the one based on the median absolute ...
2年前|0
|accepted
回答
flip the sign at zero crossing point
Data1 = [1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0];k = (~ Data1找到); if ~isempty(k) if k(end)
flip the sign at zero crossing point
Data1 = [1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0];k = (~ Data1找到); if ~isempty(k) if k(end)
2年前|0
回答
Issue with 'for' loop - trying to iterate through and change certain values to 0 in array
如果必须准确地相等，则只有x_results（x_results == .3095）= 0;没有其他东西（有时会产生不正确的结果...
Issue with 'for' loop - trying to iterate through and change certain values to 0 in array
如果必须准确地相等，则只有x_results（x_results == .3095）= 0;没有其他东西（有时会产生不正确的结果...
2年前|0
回答
Specify eigenvector for eigs
Matlab documentation: 'StartVector' — Initial starting vector random vector (default) | vector Initial starting vector, spe...
Specify eigenvector for eigs
Matlab documentation: 'StartVector' — Initial starting vector random vector (default) | vector Initial starting vector, spe...
2年前|0
回答
如何在按钮字符串上“包裹文本”？
Use the cell array with entries containing text fragments to be shown in separate strings.
如何在按钮字符串上“包裹文本”？
Use the cell array with entries containing text fragments to be shown in separate strings.
2年前|0
回答
是否有任何方法可以加速解决一系列大型稀疏正定线性方程“ ax = b”，“ ax = b”具有相同的“ a”和“不同” b”？
It depends... Besides inv(A), you can try A\eye(n), pinv(A)--all of them are equivalent for a well-conditioned A and different ...
是否有任何方法可以加速解决一系列大型稀疏正定线性方程“ ax = b”，“ ax = b”具有相同的“ a”和“不同” b”？
It depends... Besides inv(A), you can try A\eye(n), pinv(A)--all of them are equivalent for a well-conditioned A and different ...
2年前|0
回答
是否有任何方法可以计算矩阵的倒数？
我不确定它在数字上有多赚钱，但是Sherman Morrison定理可以是一种方式，请参阅https：//en wikipedia.org ...
是否有任何方法可以计算矩阵的倒数？
我不确定它在数字上有多赚钱，但是Sherman Morrison定理可以是一种方式，请参阅https：//en wikipedia.org ...
2年前|1
回答
What does ''all'' mean in M = min(A, []. ''all'') ?
所有这些在MATLAB文档中都得到了很好的描述。最小（min（a））和min（a，[]，'all''）等效于1d和2d ...
What does ''all'' mean in M = min(A, []. ''all'') ?
所有这些在MATLAB文档中都得到了很好的描述。最小（min（a））和min（a，[]，'all''）等效于1d和2d ...
2年前|0
回答
如果我有多个功能，那么如何获得最小的功能（fun1，fun2，fun3，...）？
xmin = min（[r1（x（:)'）; r2（x（：）'）; ...]）;％要获得正确的结果，该参数必须是行矢量：x（:)'转动任何输入数组t ...
如果我有多个功能，那么如何获得最小的功能（fun1，fun2，fun3，...）？
xmin = min（[r1（x（:)'）; r2（x（：）'）; ...]）;％要获得正确的结果，该参数必须是行矢量：x（:)'转动任何输入数组t ...
2年前|0
|accepted
回答
额面的两条线之间的角度
If, as it looks in the figure, (...Y) are the verticle coordinates and (...Z) are the horizontal coordinates, then the basic geo...
额面的两条线之间的角度
If, as it looks in the figure, (...Y) are the verticle coordinates and (...Z) are the horizontal coordinates, then the basic geo...
2年前|1
|accepted
回答
solve function give a wrong solution
syms x solv = double(solve( (1+x/12)^12 == 1.02)) There are many solutions. The one you are interested in is rather 0.01981897...
solve function give a wrong solution
syms x solv = double(solve( (1+x/12)^12 == 1.02)) There are many solutions. The one you are interested in is rather 0.01981897...
2年前|0
|accepted
回答
How to see the current value of the variable in "fminsearch" optimization?
optimset('Display','iter'); From Matlab documentation: 'Display' — Level of display 'notify' (default) | 'final' | 'off' | 'n...
How to see the current value of the variable in "fminsearch" optimization?
optimset('Display','iter'); From Matlab documentation: 'Display' — Level of display 'notify' (default) | 'final' | 'off' | 'n...
2年前|0
回答
showing the distance between the two plots on two curves at regular intervals on the same plot
t = 0：0.2：10;％避免在可能的地方进行循环，而是使用元素操作x = t。^2;y = 0.5*x+10;％与“ y = 0.5*”相同
showing the distance between the two plots on two curves at regular intervals on the same plot
t = 0：0.2：10;％避免在可能的地方进行循环，而是使用元素操作x = t。^2;y = 0.5*x+10;％与“ y = 0.5*”相同
2年前|0
|accepted
回答
写入.txt文件
T = [v angle_random]; % this is if you want a 2-column file save('random_cylind.txt','T','-ascii','-double'); % explore availab...
写入.txt文件
T = [v angle_random]; % this is if you want a 2-column file save('random_cylind.txt','T','-ascii','-double'); % explore availab...
2年前|0
|accepted
回答
Debugging using external editor
//www.tianjin-qmedu.com/help/matlab/matlab_external/debugging-on-microsoft-windows-platforms.html
Debugging using external editor
//www.tianjin-qmedu.com/help/matlab/matlab_external/debugging-on-microsoft-windows-platforms.html
2年前|0
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